X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
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X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=X²+2xy+y²/xy乘x²-2xy+y²/xy+
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²
=(x+y)²/xy×(x-y)²/y(x+y)
=(x+y)(x-y)²/xy²