数学题解答

2(x-y)(x+y)-(2x-y)(x+2Y)

2025-04-09 02:27:40

推荐回答（4个）

回答1：

2(x-y)(x+y)-(2x-y)(x+2y)
解：原式=2（x^2-y^2）-(2x^2+3xy-2y^2)
=2x^2-2y^2-2x^2-3xy+2y^2
=-3xy

回答2：

2(x-y)(x+y)-(2x-y)(x+2y)
解：=2(x^2-y^2)-(2x^2+4xy-xy-2y^2)
=2x^2-2y^2-2x^2-3xy+2y^2
=-3xy

回答3：

2(x-y)(x+y)-(2x-y)(x+2Y)
=2(x^2-y^2)-(2x^2+4xy-xy-2y^2)
=2x^2-2y^2-2x^2-3xy+2y^2
=-3xy

回答4：

2x^2-2y^2-2x^2+2y^2-3xy
=-3xy

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