若x/y=2,求7x²-3xy+2y²/2x²-3xy+7y²的值 答案是8/3
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若x/y=2,求7x²-3xy+2y²/2x²-3xy+7y²的值 答案是8/3
![若x/y=2,求7x²-3xy+2y²/2x²-3xy+7y²的值 答案是8/3](/uploads/image/z/85803-51-3.jpg?t=%E8%8B%A5x%2Fy%3D2%2C%E6%B1%827x%26sup2%3B-3xy%2B2y%26sup2%3B%2F2x%26sup2%3B-3xy%2B7y%26sup2%3B%E7%9A%84%E5%80%BC+%E7%AD%94%E6%A1%88%E6%98%AF8%2F3)
x=2y
则x²=4y²
xy=2y²
所以原式=(28y²-6y²+2y²)/(8y²-6y²+7y²)
=24y²/9y²
=8/3
则x²=4y²
xy=2y²
所以原式=(28y²-6y²+2y²)/(8y²-6y²+7y²)
=24y²/9y²
=8/3
若x/y=2,求7x²-3xy+2y²/2x²-3xy+7y²的值 答案是8/3
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