d) (x + y)(x – y) + (xy^4 – x^3y^2) : (xy^2).

d) (x + y)(x – y) + (xy4 – x3y2) : (xy2).

Trả lời

d) (x + y)(x – y) + (xy4 – x3y2) : (xy2)

= x . x + x . y – x . y – y . y + (xy4) : (xy2) – (x3y2) : (xy2)

= x2 – y2 + y2 – x2 = (x2 – x2) + (y2 – y2) = 0.

Câu hỏi cùng chủ đề

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