已知x/y=2/3,求x^2-3xy+y^2/2x^2-3xy+5y^2

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已知x/y=2/3,求x^2-3xy+y^2/2x^2-3xy+5y^2已知x/y=2/3,求x^2-3xy+y^2/2x^2-3xy+5y^2已知x/y=2/3,求x^2-3xy+y^2/2x^2-

已知x/y=2/3,求x^2-3xy+y^2/2x^2-3xy+5y^2
已知x/y=2/3,求x^2-3xy+y^2/2x^2-3xy+5y^2

已知x/y=2/3,求x^2-3xy+y^2/2x^2-3xy+5y^2
x^2-3xy+y^2/2x^2-3xy+5y^2 分子分母同时除以y²
=[(x/y)²-3(x/y)+1]/[2(x/y)²-3(x/y)+5]
=(4/9-2+1)/(8/9-2+5)
=-1/7

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