已知x/y=2/7,求x^2-3xy+2y^2 / 2x^2-3xy+7y^2
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已知x/y=2/7,求x^2-3xy+2y^2/2x^2-3xy+7y^2已知x/y=2/7,求x^2-3xy+2y^2/2x^2-3xy+7y^2已知x/y=2/7,求x^2-3xy+2y^2/2x
已知x/y=2/7,求x^2-3xy+2y^2 / 2x^2-3xy+7y^2
已知x/y=2/7,求x^2-3xy+2y^2 / 2x^2-3xy+7y^2
已知x/y=2/7,求x^2-3xy+2y^2 / 2x^2-3xy+7y^2
设x=2k,y=7k(k为实数)
(x^2-3xy+2y^2) /( 2x^2-3xy+7y^2) =(4k^2-42k^2+98k^2) /( 8k^2-42k^2+7*49k^2)=20/103
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