\(\left(x+y\right)\left(4x^2-4xy+y^2\right)=7\)
mik ngại vít,,,bạn tự lm nốt nha
4x3 + y3 - 3xy2 - 7 = 0
4x3 - 4x2y + 4x2y + xy2 - 4xy2 + y3 = 7
(4x3 - 4x2y + xy2) + (4x2y - 4xy2 + y3) = 7
x(4x2 - 4xy + y2) + y(4x2 - 4xy + y2) = 7
(x + y)(4x2 - 4xy + y2) = 7
(x + y).(2x - y)2 = 7
=> .....