aidez moi svppppp erxercice merci

Bonjour,
Ex4
A= 3x-4+1-2x = x-3
B= 3x-4-1+2x = 5x-5
C= (3x-4)(1-2x) = 3x-6x²-4+8x = -6x²+11x-4
D= 3x-4(1-2x) = 3x-4+8x = 11x-4
E= 3x-4-2x = x-4

Ex5
A= 4x³+3x = x(4x²+3)
B= (3x-4)(2x+1)+(3x-4)(5x-1) = (3x-4)[2x+1+5x-1] =7x(3x-4)
C= x(1-2x)-(3x+1)(1-2x) = (1-2x)[x-(3x+1)] = (1-2x)(x-3x-1) = (1-2x)(-2x-1)
D= (3x-4)²-(1-2x)(3x-4) = (3x-4)[3x-4-(1-2x)] = (3x-4)(3x-4-1+2x) = (3x-4)(5x-5) = 5(3x-4)(x-1)
E= x² -9 = (x+3)(x-3)
F= (3x-4)²-(1-2x)² = [3x-4+(1-2x)][3x-4-(1-2x)] = (x-3)(5x-5) = 5(x-3)(x-1)
G= 2x²-3 = (x√2+√3)(x√2-√3)