已知x/y=3/5,求 (x2-xy+2y2)/(x2+2xy-y2)的值
1个回答
2011-11-14
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解:
设x=3k,则y=5k
∴ (x2-xy+2y2)/(x2+2xy-y2)
=(9k²-15k²+50k²)/(9k²+30k²-25k²)
=44k²/14k²
=22/7
设x=3k,则y=5k
∴ (x2-xy+2y2)/(x2+2xy-y2)
=(9k²-15k²+50k²)/(9k²+30k²-25k²)
=44k²/14k²
=22/7
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