diff --git a/2nd/01_Fraction_Developpement_Litteral/4E_reduire.pdf b/2nd/01_Fraction_Developpement_Litteral/4E_reduire.pdf
index 7aa6fed..fa50ce5 100644
Binary files a/2nd/01_Fraction_Developpement_Litteral/4E_reduire.pdf and b/2nd/01_Fraction_Developpement_Litteral/4E_reduire.pdf differ
diff --git a/2nd/01_Fraction_Developpement_Litteral/4E_reduire.tex b/2nd/01_Fraction_Developpement_Litteral/4E_reduire.tex
index 9d603fb..ba6a3d8 100644
--- a/2nd/01_Fraction_Developpement_Litteral/4E_reduire.tex
+++ b/2nd/01_Fraction_Developpement_Litteral/4E_reduire.tex
@@ -16,5 +16,6 @@
 
 \input{exercises.tex}
 \printcollection{banque}
-
+\vfill
+\printsolution{exercise}{4}
 \end{document}
diff --git a/2nd/01_Fraction_Developpement_Litteral/exercises.tex b/2nd/01_Fraction_Developpement_Litteral/exercises.tex
index b0943ff..ae77c63 100644
--- a/2nd/01_Fraction_Developpement_Litteral/exercises.tex
+++ b/2nd/01_Fraction_Developpement_Litteral/exercises.tex
@@ -86,122 +86,68 @@
         \begin{enumerate}
 
             \item A = $x + 1 + x - 4$
-                \begin{solution}
-                \end{solution}
-
             \item B = $x + 6 + 3 + x - 6$
-                \begin{solution}
-                    
-                \end{solution}
-
             \item C = $-3 x + 5 + 5 x$
-                \begin{solution}
-                    \begin{eqnarray*}
-                        A & = & -3 x + 5 + 5 x \\ 
-                        A & = & -3 x + 5 x + 5 \\ 
-                        A & = & ( -3 + 5 ) x + 5 \\ 
-                        A & = & 2 x + 5
-                    \end{eqnarray*}
-                \end{solution}
-
-
             \item D = $-4 + 2 x - 10 - 10 x$
-                \begin{solution}
-                    \begin{eqnarray*}
-                        A & = & -4 + 2 x - 10 - 10 x \\ 
-                        A & = & 2 x - 4 - 10 - 10 x \\ 
-                        A & = & 2 x - 14 - 10 x \\ 
-                        A & = & 2 x - 10 x - 14 \\ 
-                        A & = & ( 2 - 10 ) x - 14 \\ 
-                        A & = & -8 x - 14
-                    \end{eqnarray*}
-                \end{solution}
-
             \item E = $-1 - 8 + 8 x + 6 - 4 x$
-                \begin{solution}
-                    \begin{eqnarray*}
-                        A & = & -1 - 8 + 8 x + 6 - 4 x \\ 
-                        A & = & -9 + 8 x + 6 - 4 x \\ 
-                        A & = & 8 x - 9 + 6 - 4 x \\ 
-                        A & = & 8 x - 3 - 4 x \\ 
-                        A & = & 8 x - 4 x - 3 \\ 
-                        A & = & ( 8 - 4 ) x - 3 \\ 
-                        A & = & 4 x - 3
-                    \end{eqnarray*}
-                \end{solution}
-
-            \item E = $x^{  2 } + 3 + 3 x + 3 - 10 x$
-                \begin{solution}
-                    \begin{eqnarray*}
-                        A & = & x^{  2 } + 3 + 3 x + 3 - 10 x \\ 
-                        A & = & x^{  2 } + 3 x + 3 + 3 - 10 x \\ 
-                        A & = & x^{  2 } + 3 x + 6 - 10 x \\ 
-                        A & = & x^{  2 } + 3 x - 10 x + 6 \\ 
-                        A & = & x^{  2 } + ( 3 - 10 ) x + 6 \\ 
-                        A & = & x^{  2 } - 7 x + 6
-                    \end{eqnarray*}
-                \end{solution}
-
-
-            \item F = $-6 x^{  2 } + 9 - 2 x - 2 - 6 x$
-                \begin{solution}
-                    \begin{eqnarray*}
-                        A & = & -6 x^{  2 } + 9 - 2 x - 2 - 6 x \\ 
-                        A & = & -6 x^{  2 } - 2 x + 9 - 2 - 6 x \\ 
-                        A & = & -6 x^{  2 } - 2 x + 7 - 6 x \\ 
-                        A & = & -6 x^{  2 } - 2 x - 6 x + 7 \\ 
-                        A & = & -6 x^{  2 } + ( -2 - 6 ) x + 7 \\ 
-                        A & = & -6 x^{  2 } - 8 x + 7
-                    \end{eqnarray*}
-                \end{solution}
-
-            \item G = $3 x^{  2 } + 1 x^{  2 } - 9 x - 9 + 3 x$
-                \begin{solution}
-                    \begin{eqnarray*}
-                        A & = & 3 x^{  2 } + 1 x^{  2 } - 9 x - 9 + 3 x \\ 
-                        A & = & 3 x^{  2 } + x^{  2 } - 9 x - 9 + 3 x \\ 
-                        A & = & ( 3 + 1 ) x^{  2 } - 9 x - 9 + 3 x \\ 
-                        A & = & 4 x^{  2 } - 9 x - 9 + 3 x \\ 
-                        A & = & 4 x^{  2 } - 9 x + 3 x - 9 \\ 
-                        A & = & 4 x^{  2 } + ( -9 + 3 ) x - 9 \\ 
-                        A & = & 4 x^{  2 } - 6 x - 9
-                    \end{eqnarray*}
-                \end{solution}
-
-            \item G = $-2 x^{  2 } + 7 - 6 x - 6 x^{  2 } - 2 x$
-                \begin{solution}
-                    \begin{eqnarray*}
-                        A & = & -2 x^{  2 } + 7 - 6 x - 6 x^{  2 } - 2 x \\ 
-                        A & = & -2 x^{  2 } - 6 x + 7 - 6 x^{  2 } - 2 x \\ 
-                        A & = & -2 x^{  2 } - 6 x^{  2 } - 6 x + 7 - 2 x \\ 
-                        A & = & ( -2 - 6 ) x^{  2 } - 6 x + 7 - 2 x \\ 
-                        A & = & -8 x^{  2 } - 6 x + 7 - 2 x \\ 
-                        A & = & -8 x^{  2 } - 6 x - 2 x + 7 \\ 
-                        A & = & -8 x^{  2 } + ( -6 - 2 ) x + 7 \\ 
-                        A & = & -8 x^{  2 } - 8 x + 7
-                    \end{eqnarray*}
-                \end{solution}
+            \item F = $x^{  2 } + 3 + 3 x + 3 - 10 x$
+            \item G = $-6 x^{  2 } + 9 - 2 x - 2 - 6 x$
+            \item H = $3 x^{  2 } + 1 x^{  2 } - 9 x - 9 + 3 x$
+            \item I = $-2 x^{  2 } + 7 - 6 x - 6 x^{  2 } - 2 x$
         \end{enumerate}
     \end{multicols}
 \end{exercise}
 
 \begin{solution}
+    \begin{multicols}{3}
     \begin{enumerate}
         \item 
-            \begin{eqnarray*}
+            \begin{align*}
                 A & = & x + 1 + x - 4 \\ 
-                A & = & x + x + 1 - 4 \\ 
-                A & = & ( 1 + 1 ) x + 1 - 4 \\ 
                 A & = & 2 x - 3
-            \end{eqnarray*}
+            \end{align*}
         \item
-            \begin{eqnarray*}
-                        B & = & x + 6 + 3 + x - 6 \\ 
-                        B & = & x + 9 + x - 6 \\ 
-                        B & = & x + x + 9 - 6 \\ 
-                        B & = & ( 1 + 1 ) x + 9 - 6 \\ 
-                        B & = & 2 x + 3
-                    \end{eqnarray*}
+            \begin{align*}
+                B & = & x + 6 + 3 + x - 6 \\ 
+                B & = & 2 x + 3
+            \end{align*}
+        \item 
+            \begin{align*}
+                C & = & -3 x + 5 + 5 x \\ 
+                C & = & 2 x + 5
+            \end{align*}
+        \item 
+            \begin{align*}
+                D & = & -4 + 2 x - 10 - 10 x \\ 
+                D & = & -8 x - 14
+            \end{align*}
+        \item
+            \begin{align*}
+                E & = & -1 - 8 + 8 x + 6 - 4 x \\ 
+                E & = & -9 + 8 x + 6 - 4 x \\ 
+                E & = & 4 x - 3
+            \end{align*}
+        \item
+            \begin{align*}
+                F & = & x^{  2 } + 3 + 3 x + 3 - 10 x \\ 
+                F & = & x^{  2 } - 7 x + 6
+            \end{align*}
+        \item
+            \begin{align*}
+                G & = & -6 x^{  2 } + 9 - 2 x - 2 - 6 x \\ 
+                G & = & -6 x^{  2 } - 8 x + 7
+            \end{align*}
+        \item
+            \begin{align*}
+                H & = & 3 x^{  2 } + 1 x^{  2 } - 9 x - 9 + 3 x \\ 
+                H & = & 4 x^{  2 } - 6 x - 9
+            \end{align*}
+        \item
+            \begin{align*}
+                I & = & -2 x^{  2 } + 7 - 6 x - 6 x^{  2 } - 2 x \\ 
+                I & = & -8 x^{  2 } - 8 x + 7
+            \end{align*}
     \end{enumerate}
+    \end{multicols}
 \end{solution}