Réponses

2012-09-29T14:53:01+02:00

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.