若a/(b+c)=b/(c+a)=c/(a+b),则(2a+2b+c)/(a+b-3c)=( )或( )(要求写出解题说明,最好简洁易懂的)
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![若a/(b+c)=b/(c+a)=c/(a+b),则(2a+2b+c)/(a+b-3c)=( )或( )(要求写出解题说明,最好简洁易懂的)](/uploads/image/z/2679296-32-6.jpg?t=%E8%8B%A5a%2F%28b%2Bc%29%3Db%2F%28c%2Ba%29%3Dc%2F%28a%2Bb%29%2C%E5%88%99%282a%2B2b%2Bc%29%2F%28a%2Bb-3c%29%3D%EF%BC%88+%EF%BC%89%E6%88%96%EF%BC%88+%EF%BC%89%EF%BC%88%E8%A6%81%E6%B1%82%E5%86%99%E5%87%BA%E8%A7%A3%E9%A2%98%E8%AF%B4%E6%98%8E%2C%E6%9C%80%E5%A5%BD%E7%AE%80%E6%B4%81%E6%98%93%E6%87%82%E7%9A%84%EF%BC%89)
若a/(b+c)=b/(c+a)=c/(a+b),则(2a+2b+c)/(a+b-3c)=( )或( )(要求写出解题说明,最好简洁易懂的)
若a/(b+c)=b/(c+a)=c/(a+b),则(2a+2b+c)/(a+b-3c)=( )或( )
(要求写出解题说明,最好简洁易懂的)
若a/(b+c)=b/(c+a)=c/(a+b),则(2a+2b+c)/(a+b-3c)=( )或( )(要求写出解题说明,最好简洁易懂的)
a/(b+c)=b/(c+a)=c/(a+b)
当a+b+c=0时,
a/(b+c)=b/(c+a)=c/(a+b)=-1
(2a+2b+c)/(a+b-3c)=(2a+2b-a-b)/(a+b+3a+3b)=1/4
当a+b+c≠0时
a/(b+c)=b/(c+a)=c/(a+b)=(a+b+c)/(b+c+c+a+a+b)=1/2
a=b=c
(2a+2b+c)/(a+b-3c)=(2a+2a+a)/(a+a-3a)=-5
(2a+2b+c)/(a+b-3c)=(1/4 )或( -5 )