作业帮[(x+y)²-(x-y)²] ÷（xy)
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/19 01:53:11
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[(x+y)²-(x-y)²] ÷（xy)
[(x+y)²-(x-y)²] ÷（xy)
[(x+y)²-(x-y)²] ÷（xy)
[(x+y)²-(x-y)²] ÷（xy)
=（x^2+2xy+y^2-x^2+2xy-y^2)÷（xy)
=(4xy)÷（xy)
=4
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来源：学生作业帮助网 编辑：作业帮 时间：2024/07/19 01:53:11
[(x+y)²-(x-y)²] ÷（xy)
[(x+y)²-(x-y)²] ÷（xy)
[(x+y)²-(x-y)²] ÷（xy)
[(x+y)²-(x-y)²] ÷（xy)
=（x^2+2xy+y^2-x^2+2xy-y^2)÷（xy)
=(4xy)÷（xy)
=4