[(x+y)-(x-y)二次方]÷2xy

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[(x+y)-(x-y)二次方]÷2xy
[(x+y)-(x-y)二次方]÷2xy

[(x+y)-(x-y)二次方]÷2xy
[(x+y)²-(x-y)二次方]÷2xy
=(x²+2xy+y²-x²+2xy-y²)÷2xy
=4xy÷2xy
=2