Sagot :
A=x^2 (x au carré) + 2 + 2x + x
A= x^2 + 2 + 3x
B= x^2 -2x + 2 - x
B= x^2 -3x + 2
D= x^2 + 2 + 3x - x^2 + 3x - 2 + x = 6x
C = x^2 + 2 + 3x + x^2 - 3x + 2 = 2x^2 + 4 =
A=(x^2+2)(x^2+1)
=x^2+x+2x+2
= x^2+3x+2
B = (x-2) (x-1)
= x^2 -x -2x+2
= x^2-3x+2
C = A+B
= x^2+3x+2+x^2-3x+2
= 2x^2 +4
D=A-B
= x^2+3x+2 - (x^2-3x+2)
= x^2+3x+2 - x^2 +3x -2
= 6x