Sagot :
Bonjour
Résoudre les équations suivantes :
a) 2x (5x-4) ( - 7x - 2) = 0
2x = 0 ou 5x - 4 = 0 ou - 7x - 2 = 0
x = 0 5x = 4 - 7x = 2
x = 4/5 x = - 2/7
b) (6x-1)² = 0
6x - 1 = 0
6x = 1
x = 1/6
c) (7/8x - 9) (5/4x - 2/3) = 0
7/8x - 9 = 0 ou 5/4x - 2/3 = 0
7/8x = 9 5/4x = 2/3
7x = 72 15x = 8
x = 72/7 x = 8/15