化简:[(x+y)²-(x-y)²]÷2xy
4个回答
此题用的是完全平方公式
(x+y)^2=x^2+2xy+y^2
(x-y)^2=x^2-2xy+y^2
所以(x+y)^2-(x-y)^2=4xy
所以原式等于4xy/2xy=2
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