Update textbook.fr.md

12.temporary_ins/40.classical-mechanics/30.n3/07.coherence/textbook.fr.md

@@ -108,9 +108,9 @@ Loi de composition galiléenne des vitesses :
 
 $`\left\{\begin{array}{l}
 dt' = dt \\
-\dfrac{dx'}(dt'}=\dfrac{dx}(dt}-V_x \\
-\dfrac{dy'}(dt'}=\dfrac{dy}(dt}-V_y \\
-\dfrac{dz'}(dt'}=\dfrac{dz}(dt}-V_z \\
+\dfrac{dx'}{dt'}=\dfrac{dx}{dt}-V_x \\
+\dfrac{dy'}{dt'}=\dfrac{dy}{dt}-V_y \\
+\dfrac{dz'}{dt'}=\dfrac{dz}{dt}-V_z
 \end{array}\right.`$
 $`\quad\Longrightarrow\quad
 \left\{\begin{array}{l}