Tìm x, biết
Bài 3. Tìm x, biết:
a) (x – 2)^2 – x(x – 1) = 10
b) 2x (5 – 3x ) + (x + 3)^2 = 1 – 5x^2
c) (x + 2)(x^2 – 2x + 4) – x(x + 3)(x – 3) = 26
d) 2x^2 + 3(x – 1)(x + 1) = 5x( x + 1)
e) ( 2x + 1)^2 – (x – 1)(4x + 1) = 6x – 5
a) (x – 2)^2 – x(x – 1) = 10
b) 2x (5 – 3x ) + (x + 3)^2 = 1 – 5x^2
c) (x + 2)(x^2 – 2x + 4) – x(x + 3)(x – 3) = 26
d) 2x^2 + 3(x – 1)(x + 1) = 5x( x + 1)
e) ( 2x + 1)^2 – (x – 1)(4x + 1) = 6x – 5