x/y=2/7,求x²-3xy+2y²/2x²-3xy+7y²

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x/y=2/7,求x²-3xy+2y²/2x²-3xy+7y²

x/y=2/7,求x²-3xy+2y²/2x²-3xy+7y²
x/y=2/7,求x²-3xy+2y²/2x²-3xy+7y²

x/y=2/7,求x²-3xy+2y²/2x²-3xy+7y²
x/y=2/7,求x²-3xy+2y²/2x²-3xy+7y²
x=2y
x²-3xy+2y² = 4y²-6y²+2y² =0
原式 =0