等比性质:如果a/b=c/d=…=m/n(b+d+…+n≠0),那么(a+c+…+m)/(b+d+…+n)=a/b
如果a/b=c/d=…=m/n(b±d±…±n≠0),那么(a±c±…±m)/(b±d±…±n)=a/b
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