Explications étape par étape:
1°)
A= 3x+6
= 3×x +3×2
3(x+2)
B= x^2-x
=x × x - x
= x(x-1)
C= (2x-7)(x+11)+(2x-7)^2
=(2x-7)(x+11)+(2x-7)(2x-7)
=(2x-7)[(x+11)+(2x-7)]
=(2x-7)[x+11+2x-7]
=(2x-7)(3x+4)
2°) 10^3 + 10^-1 ÷ 10
= 10^2÷10
=10^1
