化简求值【(x+2y)的平方-(x+y)(x-y)-5y方】除2x ,其中x=-2,y=2分之1
人气:354 ℃ 时间:2019-08-20 03:09:09
解答
解【(x+2y)的平方-(x+y)(x-y)-5y方】÷(2x )
=[x^2+4xy+4y^2-(x^2-y^2)-5y^2]÷(2x )
=[x^2+4xy+4y^2-x^2+y^2-5y^2]÷(2x )
=[x^2+4xy-x^2]÷(2x )
=[4xy]÷(2x )
=2y
=2×1/2
=1
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