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若x/y=2/3,分式2x^2+xy+3y^2/x^2-xy+2y^2的值
人气:425 ℃ 时间:2019-11-09 19:05:27
解答
令x=2a,y=3a,a≠0
2x^2+xy+3y^2/x^2-xy+2y^2
=8a²+6a²+27a²/4a²-6a²+18a²
=41a²/16a²
=41/16
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