{(x+y)²-(x-y)²}÷(2xy)怎么做?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/18 05:30:23
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{(x+y)²-(x-y)²}÷(2xy)怎么做?
{(x+y)²-(x-y)²}÷(2xy)怎么做?
{(x+y)²-(x-y)²}÷(2xy)怎么做?
原式=﹙x²+2xy+y²-x²+2xy-y²﹚÷2xy
=4xy÷2xy
=2
直接全部拆开了做。