Répondre :
A= 2(6x+3)+(-2x+5)
2*6x+2*3-2x+5
12x+6-2x+5
10x+11
B= (5x+7)-(-2x+3)
5x+7+2x-3
7x+4
C= (5x-7)(2x-3)
5x*2x+5x*(-3)-7*2x-7*(-3)
10x²-15x-14x+21
10x²-29x+21
D= (5x+7)(-2x+3)
5x*(-2x)+5x*3+7*(-2x)+7*3
-10x²+15x-14x+21
-10x²+x+21