Sagot :
A= 9-x-y+x+7 = -y+16
B= -8a-10
C=3y-6+5y²+5y = 5y²+8y-6
D=(x+3)(2x+5)
=2x²+5x+6x+15
=2x²+11x+15
Développer et réduire chaque expressions: A=9-(x+y)+(x-7) B=-2(4a+5) C=3(y-2)+5y(y+1) D=(x+3)(2x+5)
A= 9-x-y+x+7 = -y+16
B= -8a-10
C=3y-6+5y²+5y = 5y²+8y-6
D=(x+3)(2x+5)
=2x²+5x+6x+15
=2x²+11x+15