若x/y=2/7,求x^2-3xy+2y^2/2x^2-3xy+7y^2的值.
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若x/y=2/7,求x^2-3xy+2y^2/2x^2-3xy+7y^2的值.若x/y=2/7,求x^2-3xy+2y^2/2x^2-3xy+7y^2的值.若x/y=2/7,求x^2-3xy+2y^2
若x/y=2/7,求x^2-3xy+2y^2/2x^2-3xy+7y^2的值.
若x/y=2/7,求x^2-3xy+2y^2/2x^2-3xy+7y^2的值.
若x/y=2/7,求x^2-3xy+2y^2/2x^2-3xy+7y^2的值.
令x=2k y=7k
代入
x^2-3xy+2y^2/2x^2-3xy+7y^2
=4k^2-42k^2+98k^2/(8k^2-42k^2+343k^2)
=20/103
49/4
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