diff --git a/exemple/solution_ciment.ipynb b/exemple/solution_ciment.ipynb
index 66a1789..8c5b95f 100644
--- a/exemple/solution_ciment.ipynb
+++ b/exemple/solution_ciment.ipynb
@@ -9,43 +9,68 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [
     {
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "\u001b[32m\u001b[1m  Resolving\u001b[22m\u001b[39m package versions...\n",
-      "\u001b[32m\u001b[1mNo Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.5/Project.toml`\n",
-      "\u001b[32m\u001b[1mNo Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.5/Manifest.toml`\n",
-      "\u001b[32m\u001b[1m  Resolving\u001b[22m\u001b[39m package versions...\n",
-      "\u001b[32m\u001b[1mNo Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.5/Project.toml`\n",
-      "\u001b[32m\u001b[1mNo Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.5/Manifest.toml`\n"
+      "\u001b[32m\u001b[1m   Resolving\u001b[22m\u001b[39m package versions...\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Project.toml`\n",
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Manifest.toml`\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m   Resolving\u001b[22m\u001b[39m package versions...\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Project.toml`\n",
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Manifest.toml`\n"
      ]
     }
    ],
    "source": [
     "#importer les packages utiles\n",
-    "import Pkg; Pkg.add(\"Cbc\")\n",
+    "import Pkg;\n",
+    "Pkg.add(\"Cbc\")\n",
     "Pkg.add(\"JuMP\")"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [
     {
-     "ename": "LoadError",
-     "evalue": "\u001b[91mMethodError: no method matching Model(::Type{Cbc.Optimizer})\u001b[39m\n\u001b[91m\u001b[0mClosest candidates are:\u001b[39m\n\u001b[91m\u001b[0m  Model(::Any, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m) at /Users/sungueve/.julia/packages/JuMP/MsUSY/src/JuMP.jl:126\u001b[39m\n\u001b[91m\u001b[0m  Model(; caching_mode, solver) at /Users/sungueve/.julia/packages/JuMP/MsUSY/src/JuMP.jl:161\u001b[39m\n\u001b[91m\u001b[0m  Model(\u001b[91m::MathOptInterface.AbstractOptimizer\u001b[39m, \u001b[91m::Dict{MathOptInterface.ConstraintIndex,AbstractShape}\u001b[39m, \u001b[91m::Set{Any}\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Dict{Symbol,Any}\u001b[39m, \u001b[91m::Int64\u001b[39m, \u001b[91m::Dict{Symbol,Any}\u001b[39m) at /Users/sungueve/.julia/packages/JuMP/MsUSY/src/JuMP.jl:126\u001b[39m\n\u001b[91m\u001b[0m  ...\u001b[39m",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[91mMethodError: no method matching Model(::Type{Cbc.Optimizer})\u001b[39m\n\u001b[91m\u001b[0mClosest candidates are:\u001b[39m\n\u001b[91m\u001b[0m  Model(::Any, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m) at /Users/sungueve/.julia/packages/JuMP/MsUSY/src/JuMP.jl:126\u001b[39m\n\u001b[91m\u001b[0m  Model(; caching_mode, solver) at /Users/sungueve/.julia/packages/JuMP/MsUSY/src/JuMP.jl:161\u001b[39m\n\u001b[91m\u001b[0m  Model(\u001b[91m::MathOptInterface.AbstractOptimizer\u001b[39m, \u001b[91m::Dict{MathOptInterface.ConstraintIndex,AbstractShape}\u001b[39m, \u001b[91m::Set{Any}\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Any\u001b[39m, \u001b[91m::Dict{Symbol,Any}\u001b[39m, \u001b[91m::Int64\u001b[39m, \u001b[91m::Dict{Symbol,Any}\u001b[39m) at /Users/sungueve/.julia/packages/JuMP/MsUSY/src/JuMP.jl:126\u001b[39m\n\u001b[91m\u001b[0m  ...\u001b[39m",
-      "",
-      "Stacktrace:",
-      " [1] top-level scope at In[3]:11",
-      " [2] include_string(::Function, ::Module, ::String, ::String) at ./loading.jl:1091"
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Max 50 ciment[1] + 70 ciment[2]\n",
+      "Subject to\n",
+      " 40 ciment[1] + 12 ciment[2] ≤ 360.0\n",
+      " 20 ciment[1] + 30 ciment[2] ≤ 480.0\n",
+      " ciment[1] ≥ 0.0\n",
+      " ciment[2] ≥ 0.0\n",
+      "\n",
+      "Presolve 2 (0) rows, 2 (0) columns and 4 (0) elements\n",
+      "0  Obj -0 Dual inf 120 (2)\n",
+      "2  Obj 1137.5\n",
+      "Optimal - objective value 1137.5\n",
+      "Optimal objective 1137.5 - 2 iterations time 0.002\n"
      ]
     }
    ],
@@ -76,12 +101,12 @@
     "println(model)\n",
     "\n",
     "# run optimization\n",
-    "optimize!(model)\n"
+    "optimize!(model)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [
     {
@@ -101,28 +126,21 @@
     "println(\"\\t benefice = $(objective_value(model))\")\n",
     "for i in 1:N\n",
     "    println(\"\\t quantite de ciment $i = $(value(ciment[i]))\")\n",
-    "end\n"
+    "end"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Julia 1.5.3",
+   "display_name": "Julia 1.6.3",
    "language": "julia",
-   "name": "julia-1.5"
+   "name": "julia-1.6"
   },
   "language_info": {
    "file_extension": ".jl",
    "mimetype": "application/julia",
    "name": "julia",
-   "version": "1.5.3"
+   "version": "1.6.3"
   }
  },
  "nbformat": 4,
diff --git a/exo1/voitures.ipynb b/exo1/voitures.ipynb
new file mode 100644
index 0000000..de20602
--- /dev/null
+++ b/exo1/voitures.ipynb
@@ -0,0 +1,186 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Exemple de modèle et résolution du problème de Fabrication du voitures"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m   Resolving\u001b[22m\u001b[39m package versions...\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Project.toml`\n",
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Manifest.toml`\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m   Resolving\u001b[22m\u001b[39m package versions...\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Project.toml`\n",
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Manifest.toml`\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importer les packages utiles\n",
+    "import Pkg;\n",
+    "Pkg.add(\"Cbc\")\n",
+    "Pkg.add(\"JuMP\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Max 10000 voitures[1] + 9000 voitures[2]\n",
+      "Subject to\n",
+      " 10 voitures[1] + 20 voitures[2] ≤ 15000.0\n",
+      " 6 voitures[1] + 5 voitures[2] ≤ 6000.0\n",
+      " voitures[1] ≤ 800.0\n",
+      " voitures[1] ≥ 0.0\n",
+      " voitures[2] ≥ 0.0\n",
+      " voitures[1] integer\n",
+      " voitures[2] integer\n",
+      "\n",
+      "Welcome to the CBC MILP Solver \n",
+      "Version: 2.10.5 \n",
+      "Build Date: Jan  1 1970 \n",
+      "\n",
+      "command line - Cbc_C_Interface -solve -quit (default strategy 1)\n",
+      "Continuous objective value is 1.02857e+07 - 0.00 seconds\n",
+      "Cgl0004I processed model has 2 rows, 2 columns (2 integer (0 of which binary)) and 4 elements\n",
+      "Cutoff increment increased from 1e-05 to 1000\n",
+      "Cbc0012I Integer solution of -10272000 found by DiveCoefficient after 0 iterations and 0 nodes (0.00 seconds)\n",
+      "Cbc0012I Integer solution of -10284000 found by DiveCoefficient after 3 iterations and 0 nodes (0.01 seconds)\n",
+      "Cbc0031I 1 added rows had average density of 2\n",
+      "Cbc0013I At root node, 1 cuts changed objective from -10285714 to -10284000 in 21 passes\n",
+      "Cbc0014I Cut generator 0 (Probing) - 0 row cuts average 0.0 elements, 47 column cuts (47 active)  in 0.001 seconds - new frequency is 1\n",
+      "Cbc0014I Cut generator 1 (Gomory) - 4 row cuts average 2.0 elements, 0 column cuts (0 active)  in 0.001 seconds - new frequency is 1\n",
+      "Cbc0014I Cut generator 2 (Knapsack) - 0 row cuts average 0.0 elements, 0 column cuts (0 active)  in 0.000 seconds - new frequency is -100\n",
+      "Cbc0014I Cut generator 3 (Clique) - 0 row cuts average 0.0 elements, 0 column cuts (0 active)  in 0.000 seconds - new frequency is -100\n",
+      "Cbc0014I Cut generator 4 (MixedIntegerRounding2) - 0 row cuts average 0.0 elements, 0 column cuts (0 active)  in 0.000 seconds - new frequency is -100\n",
+      "Cbc0014I Cut generator 5 (FlowCover) - 0 row cuts average 0.0 elements, 0 column cuts (0 active)  in 0.000 seconds - new frequency is -100\n",
+      "Cbc0001I Search completed - best objective -10284000, took 3 iterations and 0 nodes (0.01 seconds)\n",
+      "Cbc0035I Maximum depth 0, 0 variables fixed on reduced cost\n",
+      "Cuts at root node changed objective from -1.02857e+07 to -1.0284e+07\n",
+      "Probing was tried 21 times and created 47 cuts of which 0 were active after adding rounds of cuts (0.001 seconds)\n",
+      "Gomory was tried 21 times and created 4 cuts of which 0 were active after adding rounds of cuts (0.001 seconds)\n",
+      "Knapsack was tried 21 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.000 seconds)\n",
+      "Clique was tried 21 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.000 seconds)\n",
+      "MixedIntegerRounding2 was tried 21 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.000 seconds)\n",
+      "FlowCover was tried 21 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.000 seconds)\n",
+      "TwoMirCuts was tried 1 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.000 seconds)\n",
+      "ZeroHalf was tried 1 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.000 seconds)\n",
+      "\n",
+      "Result - Optimal solution found\n",
+      "\n",
+      "Objective value:                10284000.00000000\n",
+      "Enumerated nodes:               0\n",
+      "Total iterations:               3\n",
+      "Time (CPU seconds):             0.01\n",
+      "Time (Wallclock seconds):       0.01\n",
+      "\n",
+      "Total time (CPU seconds):       0.01   (Wallclock seconds):       0.01\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "using Cbc\n",
+    "using JuMP\n",
+    "\n",
+    "# data\n",
+    "N = 2 # nombre de voitures disponibles\n",
+    "c = [10000, 9000] # prix de vente par voitures\n",
+    "b = [15000, 6000, 800] \n",
+    "A = [10 20 ; 6 5 ; 1 0]\n",
+    "\n",
+    "# set optimizer\n",
+    "model = Model(Cbc.Optimizer)\n",
+    "\n",
+    "# define variables\n",
+    "@variable(model, voitures[1:N] >= 0, integer=true)\n",
+    "\n",
+    "# define objective function\n",
+    "@objective(model, Max, sum(c[i] * voitures[i] for i = 1:N))\n",
+    "\n",
+    "# define constraints\n",
+    "for i = 1:length(b)\n",
+    "    @constraint(model, sum(A[i, j] * voitures[j] for j = 1:N) <= b[i])\n",
+    "end\n",
+    "\n",
+    "println(model)\n",
+    "\n",
+    "# run optimization\n",
+    "optimize!(model)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Solution obtenue:\n",
+      "\t benefice = 1.0284e7\n",
+      "\t quantite de voitures 1 = 645.0\n",
+      "\t quantite de voitures 2 = 426.0\n"
+     ]
+    }
+   ],
+   "source": [
+    "# print solution\n",
+    "println(\"Solution obtenue:\")\n",
+    "println(\"\\t benefice = $(objective_value(model))\")\n",
+    "for i = 1:N\n",
+    "    println(\"\\t quantite de voitures $i = $(value(voitures[i]))\")\n",
+    "end"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Julia 1.6.3",
+   "language": "julia",
+   "name": "julia-1.6"
+  },
+  "language_info": {
+   "file_extension": ".jl",
+   "mimetype": "application/julia",
+   "name": "julia",
+   "version": "1.6.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}
diff --git a/exo3/bourse.ipynb b/exo3/bourse.ipynb
new file mode 100644
index 0000000..a5f044b
--- /dev/null
+++ b/exo3/bourse.ipynb
@@ -0,0 +1,168 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Exemple de modèle et résolution du problème de Fabrication du produits"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m   Resolving\u001b[22m\u001b[39m package versions...\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Project.toml`\n",
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Manifest.toml`\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m   Resolving\u001b[22m\u001b[39m package versions...\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Project.toml`\n",
+      "\u001b[32m\u001b[1m  No Changes\u001b[22m\u001b[39m to `~/.julia/environments/v1.6/Manifest.toml`\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importer les packages utiles\n",
+    "import Pkg;\n",
+    "Pkg.add(\"Cbc\")\n",
+    "Pkg.add(\"JuMP\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Max 0.07 produits[1] + 0.1 produits[2] + 0.19 produits[3] + 0.12 produits[4] + 0.8 produits[5] + 0.14 produits[6]\n",
+      "Subject to\n",
+      " produits[1] + produits[2] + produits[3] + produits[4] + produits[5] + produits[6] = 1.0\n",
+      " produits[1] + produits[2] ≥ 0.45\n",
+      " produits[3] + produits[4] ≥ 0.3\n",
+      " 1.7 produits[1] + 1.2 produits[2] + 3.7 produits[3] + 2.4 produits[4] + 2 produits[5] + 2.9 produits[6] ≤ 2.0\n",
+      " produits[1] ≤ 0.25\n",
+      " produits[2] ≤ 0.25\n",
+      " produits[3] ≤ 0.25\n",
+      " produits[4] ≤ 0.25\n",
+      " produits[5] ≤ 0.25\n",
+      " produits[6] ≤ 0.25\n",
+      " produits[1] ≥ 0.0\n",
+      " produits[2] ≥ 0.0\n",
+      " produits[3] ≥ 0.0\n",
+      " produits[4] ≥ 0.0\n",
+      " produits[5] ≥ 0.0\n",
+      " produits[6] ≥ 0.0\n",
+      "\n",
+      "Presolve 4 (-6) rows, 6 (0) columns and 16 (-6) elements\n",
+      "0  Obj 0.016999999 Primal inf 1.349997 (3) Dual inf 1.419994 (6)\n",
+      "5  Obj 0.28253846\n",
+      "Optimal - objective value 0.28253846\n",
+      "After Postsolve, objective 0.28253846, infeasibilities - dual 0 (0), primal 0 (0)\n",
+      "Optimal objective 0.2825384615 - 5 iterations time 0.002, Presolve 0.00\n"
+     ]
+    }
+   ],
+   "source": [
+    "using Cbc\n",
+    "using JuMP\n",
+    "\n",
+    "# data\n",
+    "N = 6 # nombre de produits disponibles\n",
+    "risques = [1.7 1.2 3.7 2.4 2.0 2.9]\n",
+    "interets = [ 0.07 0.10 0.19 0.12 0.8 0.14]\n",
+    "\n",
+    "# set optimizer\n",
+    "model = Model(Cbc.Optimizer)\n",
+    "\n",
+    "# define variables\n",
+    "@variable(model, produits[1:N] >= 0)\n",
+    "\n",
+    "# define objective function\n",
+    "@objective(model, Max, sum(interets[i] * produits[i] for i = 1:N))\n",
+    "\n",
+    "# define constraints\n",
+    "@constraint(model, sum(produits[i] for i = 1:N) == 1.0) # somme à 100%\n",
+    "@constraint(model, sum(produits[i]*risques[i] for i = 1:N) <= 2.0) # risque total\n",
+    "@constraint(model, produits[1] + produits[2] >= 0.45)\n",
+    "@constraint(model, produits[3] + produits[4] >= 0.3)\n",
+    "for i = 1:N\n",
+    "    @constraint(model, produits[i] <= 0.25) # limite de 25%\n",
+    "end\n",
+    "\n",
+    "println(model)\n",
+    "\n",
+    "# run optimization\n",
+    "optimize!(model)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Solution obtenue:\n",
+      "\t benefice = 0.2825384615384615\n",
+      "\t quantite de produits 1 = 0.2\n",
+      "\t quantite de produits 2 = 0.25\n",
+      "\t quantite de produits 3 = 0.10769230769230764\n",
+      "\t quantite de produits 4 = 0.19230769230769232\n",
+      "\t quantite de produits 5 = 0.25\n",
+      "\t quantite de produits 6 = 0.0\n"
+     ]
+    }
+   ],
+   "source": [
+    "# print solution\n",
+    "println(\"Solution obtenue:\")\n",
+    "println(\"\\t benefice = $(objective_value(model))\")\n",
+    "for i = 1:N\n",
+    "    println(\"\\t quantite de produits $i = $(value(produits[i]))\")\n",
+    "end"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Julia 1.6.3",
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+   "name": "julia-1.6"
+  },
+  "language_info": {
+   "file_extension": ".jl",
+   "mimetype": "application/julia",
+   "name": "julia",
+   "version": "1.6.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}