Réponse :
bonsoir
(2x+5)(-3x-1)-5(2-x)=
-6x²-2x-15x-5-10+5x=
-6x²-12x-15
2(-3x+5)+(-3x+7)(2x-9)=
-6x+10-6x²+27x+14x-63=
-6x²+35x-53
2t(3-4t)-(5-a)+(9t+2)(3t-3)=
6t-8t²-5+a+27t²-27t+6t-6=
19t²-15t+a-11
-(5-2z)(z-8)=
-5z+40+2z²-16z=
2z²-21z+40
-2s(2-s)+(-s-2)(s+5)=
-4s+2s²-s²-5s-2s-10=
s²-11s-10
(5x+8)(-3x-7)+(9x-4)(-10+2x)=
-15x²-35x-24x-56-90x+18x²+40-8x=
3x²-157x-16
(3x-5)(-2x+1)-(5x-1)(3-4x)=
-6x²+3x+10x-5-15x+20x²+3-4x=
14x²-6x-2
-5(6x-4)(7x+2)+9x(8-x)(5x+4)=
-210x²-60x+140x+40+360x²+288x-45x³-36x²=
-45x³+114x²+368x+40
-8(x+9y)-5(3y+5)(6-x)+8(3x-5y)=
-8x-72xy-90y+15xy-150+25x+24x-40y=
-57xy+41x-130y-150
Explications étape par étape
