exercice 2, le 1/ et le 2/ svp :)

1/
b.3Xx-3X8+13
c.-5X3x+5X-5
d.-7X3x2+-7X2x+7X7

1. A= -(8x+2) = -8x-2
    B= 3(x-8)+ 13 = 3x-24+13 = 3x-11
    C= -5(3x+5) = -15x-25
    D= -7(3x²+2x-7) = -21x²-14+49 = -21x²+35
2.E= 2(-x+4)-(5x+4) = -2x+8-5x-4 = -7x+4
   F= 5(3x²+x+2)-2x-2(x+4) = 15x²+5x+10-2x-2x-8 = 15x²+x+2