化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)
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化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)化简(x-2y)平方-(2x-y)(-2x-y)+(
化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)
化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)
化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)
(x-2y)²-(2x-y)(-2x-y)+(x-5y)(x+2y)
=x²+4y²-4xy-y²+4x²+2xy-5xy-10y²=6x²-7y²-7xy
化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)
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化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)
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