Tìm x sao cho: a) x2 –3x = 0
b) x2–5x –14 = 0
c) 2x2–4x = 0
d) x2–6x + 5 = 0
e) (x –2)2–(x –3)(x + 3) = 6
f) (x –4)2–(x –2)(x + 2) = 0
Loga
Sinh Học lớp 12
