【(xy+2)(xy-2)-2x的平方y的4次方+4】÷xy,其中x=1/25,y=-25(求高手,要过程)
人气:257 ℃ 时间:2020-01-29 23:33:36
解答
【(xy+2)(xy-2)-2x的平方y的4次方+4】÷xy
=(x^2y^2-4-2x^2y^2+4)÷xy
=-x^2y^2÷xy
=-xy
=1/25*25
=1
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