一.已知正数a,b,c成等比数列,x,y,z成等差数列,求证:(y-z)lga+(z-x)lgb+(x-y)lgc=0还有两道发图吧,请横着看+_+,有点难看,我错了.
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![一.已知正数a,b,c成等比数列,x,y,z成等差数列,求证:(y-z)lga+(z-x)lgb+(x-y)lgc=0还有两道发图吧,请横着看+_+,有点难看,我错了.](/uploads/image/z/2803602-66-2.jpg?t=%E4%B8%80.%E5%B7%B2%E7%9F%A5%E6%AD%A3%E6%95%B0a%2Cb%2Cc%E6%88%90%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2Cx%2Cy%2Cz%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E6%B1%82%E8%AF%81%EF%BC%9A%EF%BC%88y-z%EF%BC%89lga%2B%28z-x%29lgb%2B%28x-y%29lgc%3D0%E8%BF%98%E6%9C%89%E4%B8%A4%E9%81%93%E5%8F%91%E5%9B%BE%E5%90%A7%2C%E8%AF%B7%E6%A8%AA%E7%9D%80%E7%9C%8B%2B_%2B%2C%E6%9C%89%E7%82%B9%E9%9A%BE%E7%9C%8B%2C%E6%88%91%E9%94%99%E4%BA%86.)
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