Sagot :
Réponse :
1) S=4x2^2-x^-2x+3x-6+2x-4
=8x^-x^+x+2x-10
=7x^+3x-10
2) 7X(-5)^+3X5-10
= -35^ + 35-10
=35^+25
7X(1/2)^+3X1/2-10
=7/2^+3/2-10
=9/2-10
=4,5-10
=-5,5
Explications étape par étape :
Réponse:
S= 4×^2-(×+3)(×-2)+2(×-2)
S= 4x^2-( x^2-2×+3×-6)+2×-4
s= 4x^2- (x^2+x -6)+2×-4
s= 4x^2- x^2 -x+6+2x -4
S=3x^2+x +2
x= -5
S=3×^2+×+2
S=3(-5)^2+(-5)+2
S=3×15 -5+2
S= 45-5+2
s=40+2
s=42
×=1/2
3x^2+x+2
3(1/2)^2+(1/2)+2
3(1/4)+1/2+2
3/4+1/2+2
3/4+2/4+8/4
13/4