[(x+y)²-(x-y)²] ÷（xy)
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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)
[(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