a) (2x-1)/x = x
2x-1 = 0
2x = 1
x = 0,5
b) 2x² = 7
x² = 3,5
x = racine de 3,5 ou moins racine de 3,5
c) (x+1)²=3(2x-4)²
x²+2x+1 = 3(4x²-16x+16)
x²+2x+1 = 12x²-48x+48
x²+2x = 12x²-48x+47
x² = 12x²-50x+47
x = racine de (12x²-50x+47) ou moins racine de (12x²-50x+47)
