Tìm x, biết: 4x2 – 12x + 5 = 0

Bài 9: Tìm x biết:

1/ 4x2 – 12x + 5 = 0
2/ x2 – 3x + 2 = 0
3/ (x2+1)(4x – 3) – (x2 + 1)(x – 12) = 0
4/ (x – 3)(x + 1) – (2x + 1)(x – 3) = 0
5/ x3 + x2+ x + 1 = 0
6/ (2x – 1)2 + (2 – x)(2x – 1) = 0
7/ x2 + 5x – 6 = 0
8/ 2x2 + 3 + 5x = 0