Réponses

Meilleure réponse !
2014-10-25T15:05:11+02:00
A= 3(2x-7)+5x
A= 6x -21 + 5x
A= 11x - 21 

B= (3x+1)(5x-3)
B= 15x² -9x + 5x -3
B= 15x² - 4x -3

C= (2x-5)²
C= 2x²-2×2×5x+5²
C= 4x²-20x+25

D= (x+4)²+3(2x-4)
D= x²+2x × x4+4² + 6x-12
D= x²+8x+16+6x-12
D= x²+14x+4

E= (4-3x)²- (x-3)(7-2x)
E= 4²-2×4×3x+3x² -(7x-2x²-21+6x)
E= 16-24x+9x-7x+2x²+21-6x
E= 2x²-28x+37