Tìm x biết : a)(x + 2)(x ^ 2 - 2x + 4) - x(x ^ 2 + 2) = 1. b)5x(x-3)-2x+6=0 5x(x-3)-x+3=0

Tìm x biết : a)(x + 2)(x ^ 2 - 2x + 4) - x(x ^ 2 + 2) = 1
b)5x(x-3)-2x+6=0 5x(x-3)-x+3=0
C) (x - 3) ^ 2 - (x + 3)(x - 3) = 0
d) x ^ 2 * (x - 2) + 4x - 8 = 0
e)(2x + 1)²-(x-4)² =0
f)x ^ 2 - 4x - 5 = 0