问题 计算题

化简:[(xy﹣2)(xy+2)﹣2x2y2+4] ÷(xy).

答案

解:[(xy﹣2)(xy+2)﹣2x2y2+4]÷(xy),

=(x2y2﹣4﹣2x2y2+4)÷(xy),

=(﹣x2y2)÷(xy),

=﹣xy

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