Bonsoir
1/ (5x-10)(3x+7)=0
5(x - 2)(3x + 7) = 0
x - 2 = 0 ou 3x + 7 = 0
x = 2 ou 3x = -7
x = 2 ou x = -7/3
2/ 5x2+13x=0
x(5x + 13) = 0
x = 0 ou 5x + 13 = 0
x = 0 ou 5x = -13
x = 0 ou x = -13/5
3/ (8x-2)(-9x+6)=0
2(4x - 1) * 3(-3x + 2) = 0
6(4x - 1)(-3x + 2) = 0
4x - 1 = 0 ou -3x + 2 = 0
4x = 1 ou 3x = 2
x = 1/4 ou x = 2/3
4/ 3x(5-x)=0
3x = 0 ou 5 - x = 0
x = 0 ou x = 5
5/ 5x(3x-12)=0
5x * 3(x - 4) = 0
15x(x - 4) = 0
15x = 0 ou x - 4 = 0
x = 0 ou x = 4
6/ (X+2)(x-7)=0
x + 2 = 0 ou x - 7 = 0
x = -2 ou x = 7
7/ (9+3x)(3x-4)=0
3(3 + x)(3x - 4) = 0
3 + x = 0 ou 3x - 4 = 0
x = -3 ou 3x = 4
x = -3 ou x = 4/3
8/ 13x-9=7x+2
13x - 7x = 2 + 9
6x = 11
x = 11/6
9/ 2x+8-4x=7x+5-6x
-2x + 8 = x + 5
8 - 5 = 2x + x
3 = 3x
x = 3/3
x = 1
10/ 2x-3=-9x+6 ? Celle là n’est pas très Claire
2x - 3 # 0
2x # 3
x # 3/2