9*(1.7+ ...) = .... *1,7 +9*2.8
9*(1.7+ 2.8) = 9 *1,7 +9*2.8
7,5*( ... -4.1)=... *12.25- ... *4.1
7,5*(12.25 -4.1)=7,5 *12.25- 7,5 *4.1
... *(3.14-2.17)= 0.8*... -0.8 * ...
0.8 *(3.14-2.17)= 0.8*3.14 -0.8 * 2.17
(7.3+3.7)*... = ...*0.5+...*0.5
(7.3+3.7)*0.5 = 7.3*0.5+3.7*0.5
En espérant t'avoir aidé.
