x²-y²/x²+3xy+2y²
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x²-y²/x²+3xy+2y²
x²-y²/x²+3xy+2y²
x²-y²/x²+3xy+2y²
原式=(x+y)(x-y)/(x+2y)(x+y)
=(x-y)/(x+2y)
x²-y²/x²+3xy+2y²
x²-y²/x²+3xy+2y²
x²-y²/x²+3xy+2y²
原式=(x+y)(x-y)/(x+2y)(x+y)
=(x-y)/(x+2y)