Làm tính chia: [(x + y)^5 - 2.(x + y)^4 + 3.(x + y)^3] : [- 5.(x + y)]. Tìm x, biết: a) (4x^4 + 3x^3):( - x^3) + (15x^2 + 6x) : 3x = 0; b) (x^2 - 1/2x):2x - (3x - 1)^2:(3x - 1) = 0

1. Làm tính chia
a) [(x + y)^5 - 2.(x + y)^4 + 3.(x + y)^3] : [- 5.(x + y)]

2. Tìm x, biết
a) (4x^4 + 3x^3):( - x^3) + (15x^2 + 6x) : 3x = 0
b) (x^2 - 1/2x):2x - (3x - 1)^2:(3x - 1) = 0