Bonjour,
par exemple :
A = 4x²+2x-(3x+4x²-9)+8 = 4x²-4x²+2x-3x+9+8 = -x+17
B = 8x-5x(2-x) = 8x-10x+5x² = 5x²-2x
C = -3(2x-5)-(-2x+7) = -6x+15+2x-7 = -4x+8
D = (-4x-1)(x-9) = -4x²+36x-x+9 = -4x²+35x+9
je te laisse finir.....
bonjour
développer et réduire
a= 4x²+2x-(3x+4x²-9)+8=
4x²+2x-3x-4x²+9+8=
-x+17
b=8x-5x(2-x)=
8x-10x+5x²
c= -3(2x-5)-(-2x+7)=
-6x+15+2x-7=
-4x+8
d=(-4x-1)(x-9)=
-4x²+36x-x+9=
-4x²+35x+9
e=(3x²-4x+9)-(4x²-x+1)=
3x²-4x+9-4x²+x-1=
-x²-3x+8
f=3(7x²-1)-4x(3-5x)=
21x² -3-12x+20x²=
41x²-12x-3
g=(3-x)(4x-8)=
12x-24-4x²+8x=
-4x²+20x-24
h=7x²-4+(3x²-5x)-2(x+3)=
7x²-4+3x²-5x-2x-6=
10x²-7x-10