已知x/2=y/7=z/5,令A=y/x+y+z,B=x+z/y,C=x+y-z/x,请比较A,B,C的大小
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令x/2=y/7=z/5=k,则:x=2k,y=7k,z=5k.
∴A=7k/(2k+7k+5k)=1/2,B=(2k+5k)/(7k)=1,C=(2k+7k-5k)/(2k)=2
得:A<B<C.
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