Réponses

2013-04-02T17:56:57+02:00

A= 3(2x-6)-(3-5x)

3*2x+3*(-6)-3+5x

6x-18-3+5x

11x-21

 

B= (5-2y)-(3y+7)

5-2y-3y-7

-5y-2

 

C= 4(6+z)+(z-3)(2-7)

4*6+4*z+z*2+z*(-7)-3*2-3*(-7)

24+4z+2z-7z-6+21

-z+39

 

D= (2t+5)(3t+2)-(t²+6)

2t*3t+2t*2+5*3t+5*2-t²-6

6t²+4t+15t+10-t²-6

5t²+19t+4