Thực hiện phép tính: (5x – 2y)(x^2 – xy + 1)
Giải thích
(5x – 2y)(x2 – xy + 1)
= 5x.(x2 – xy + 1) – 2y(x2 – xy + 1)
= (5x3 – 5x2y + 5x) – (2x2y – 2xy2 + 2y)
= 5x3 – 5x2y + 5x – 2x2y + 2xy2 – 2y
= 5x3 – 7x2y + 5x + 2xy2 – 2y
(5x – 2y)(x2 – xy + 1)
= 5x.(x2 – xy + 1) – 2y(x2 – xy + 1)
= (5x3 – 5x2y + 5x) – (2x2y – 2xy2 + 2y)
= 5x3 – 5x2y + 5x – 2x2y + 2xy2 – 2y
= 5x3 – 7x2y + 5x + 2xy2 – 2y