【(x+y)²-(x-y)²】/2xy
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【(x+y)²-(x-y)²】/2xy
【(x+y)²-(x-y)²】/2xy
【(x+y)²-(x-y)²】/2xy
【(x+y)²-(x-y)²】/2xy
=[(x²+2xy+y²)-(x²-2xy+y²)]÷2xy
=4xy÷2xy
=2
【(x+y)²-(x-y)²】/2xy
【(x+y)²-(x-y)²】/2xy
【(x+y)²-(x-y)²】/2xy
【(x+y)²-(x-y)²】/2xy
=[(x²+2xy+y²)-(x²-2xy+y²)]÷2xy
=4xy÷2xy
=2