1) (1-2x)(3x-1) = 0
donc 1-2x = 0 ou 3x-1 = 0
alors x = 1/2 ou x = 1/3
S1 = {1/2,1/3}
2) (x-1)(2x-3)(1-x) = 0
donc x-1 = 0 ou 2x-3 = 0 ou 1-x = 0
alors x =1 ou x = 3/2 ou x = 1
S2 = {1,3/2}
3) 3(5-2x)-5x+3 = -2x -7
donc 15-6x-5x+3+2x+7 = 0
cĂ d -9x= -25
donc x = 25/9
s3 = {25/9}