(3x+2y)(4x-5y)-11(x+y)(x-y)+5xy,其中x=2分之七,y=-2分之5

问答/228℃/2025-02-25 18:24:54

优质解答：

(3x+2y)(4x-5y)-11(x+y)(x-y)+5xy

=12x²-7xy-10y²-11x²＋11y²＋5xy

=x²-2xy＋y²

=(x-y)²

=(7/2+5/2)²

=6²

=36

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