A) X2 – 5X = 0 B) 3(X + 2) – X2 + 4 = 0 C) X2 – 5X + 6 = 0

Bài 2 (1,5 điểm): Tìm x biết:a) x

2

– 5x = 0 b) 3(x + 2) – x

2

+ 4 = 0 c) x

2

– 5x + 6 = 0