[(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)²-(x-y)²] ÷(xy)
=(x^2+2xy+y^2-x^2+2xy-y^2)÷(xy)
=(4xy)÷(xy)
=4
[(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