... x + 2) 3( x + 1) 33 = 6 2 (3 x 1)( x + 2) 3( x + 1) = 33 (6 x + 10 x 4) (3 x + 3) = 33 x + 10 x 3x = 33 10 x = 33 + + 10 x = 40 x=4 Phơng trình có tập nghiệm S={4} ?2 x + 3x = 12 ... 0,5x(x 3) = (x 3) (1,5x 1) 0,5x(x 3) - (x 3) (1,5x 1) = (x 3) ( 0,5x - 1,5x + 1) = (x 3) (1 - x) = x = x = x = x = x = x = : S = {1, 3} x = x(3x 7) 7 3x = x(3x 7) 3x - x(3x ... + 3= 0 x = x = x = x + = x = S = { -3, 0, } b) (3x 1)(x2 + 2) = (3x 1)(7x 10) (3x 1)(x2 + 7x + 10) = (3x 1)(x2 3x 4x + 12) =0 (3x 1)[x(x 3) 4(x 3) ] = (3x 1)(x 4)(x 3) ...