若a/b-c/d=e/f=3/5,求a+c-e/b+d-f及a-2c+3e/b-2d+3f的值还有若a-2b/a+3b=5/7求a+b/b的值若x∶y=4∶3,且x-y=5,求x²-xy+y²的值
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![若a/b-c/d=e/f=3/5,求a+c-e/b+d-f及a-2c+3e/b-2d+3f的值还有若a-2b/a+3b=5/7求a+b/b的值若x∶y=4∶3,且x-y=5,求x²-xy+y²的值](/uploads/image/z/3926348-44-8.jpg?t=%E8%8B%A5a%2Fb-c%2Fd%3De%2Ff%3D3%2F5%2C%E6%B1%82a%2Bc-e%2Fb%2Bd-f%E5%8F%8Aa-2c%2B3e%2Fb-2d%2B3f%E7%9A%84%E5%80%BC%E8%BF%98%E6%9C%89%E8%8B%A5a-2b%2Fa%2B3b%3D5%2F7%E6%B1%82a%2Bb%2Fb%E7%9A%84%E5%80%BC%E8%8B%A5x%E2%88%B6y%3D4%E2%88%B63%EF%BC%8C%E4%B8%94x-y%3D5%2C%E6%B1%82x%26sup2%3B-xy%2By%26sup2%3B%E7%9A%84%E5%80%BC)
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若a/b-c/d=e/f=3/5,求a+c-e/b+d-f及a-2c+3e/b-2d+3f的值还有若a-2b/a+3b=5/7求a+b/b的值若x∶y=4∶3,且x-y=5,求x²-xy+y²的值
若a/b-c/d=e/f=3/5,求a+c-e/b+d-f及a-2c+3e/b-2d+3f的值
还有
若a-2b/a+3b=5/7求a+b/b的值
若x∶y=4∶3,且x-y=5,求x²-xy+y²的值
若a/b-c/d=e/f=3/5,求a+c-e/b+d-f及a-2c+3e/b-2d+3f的值还有若a-2b/a+3b=5/7求a+b/b的值若x∶y=4∶3,且x-y=5,求x²-xy+y²的值
∵a/b=c/d=e/f=3/5,
根据等比性质可得(a+c-e)/(b+d-f)=3/5
(a-2c+3e)/(b-2d+3f)=3/5