化简:[(xy﹣2)(xy+2)﹣2x2y2+4]÷(xy).-七年级数学
解:[(xy﹣2)(xy+2)﹣2x2y2+4]÷(xy),=(x2y2﹣4﹣2x2y2+4)÷(xy),=(﹣x2y2)÷(xy),=﹣xy
题目简介
化简:[(xy﹣2)(xy+2)﹣2x2y2+4]÷(xy).-七年级数学
题目详情
答案
解:[(xy﹣2)(xy+2)﹣2x2y2+4]÷(xy),
=(x2y2﹣4﹣2x2y2+4)÷(xy),
=(﹣x2y2)÷(xy),
=﹣xy