Thực hiện phép tính: 1/2.x^2y^2 (2x + y)(2x – y)
Giải thích
1/2.x2y2 (2x + y)(2x – y)
= 1/2.x2y2 (4x2 – 2xy + 2xy – y2)
= 1/2.x2y2 (4x2 – y2)
= 1/2.x2.y2.4x2 + 1/2.x2y2. (-y2)
= 2x4y2- 1/2.x2y4
1/2.x2y2 (2x + y)(2x – y)
= 1/2.x2y2 (4x2 – 2xy + 2xy – y2)
= 1/2.x2y2 (4x2 – y2)
= 1/2.x2.y2.4x2 + 1/2.x2y2. (-y2)
= 2x4y2- 1/2.x2y4