c) 4y(x – 1) – (1 – x) l) 18x (3 + x) + 3(x + 3)
d) (x – 3) + 3 – x m) 14x y – 21xy + 28x y
e) 7x(x – y) – (y – x) n) 10x(x – y) – 8y(y – x)
Bài toán 3 : Tìm x biết.
a) 4x(x + 1) = 8(x + 1) g) 5x(x – 2000) – x + 2000 = 0
b) x(x – 1) – 2(1 – x) = 0 h) x – 4x = 0
c) 2x(x – 2) – (2 – x) = 0 k) (1 – x) – 1 + x = 0
d) (x – 3) + 3 – x = 0 m) x + 6x = 0
Loga
Sinh Học lớp 12
