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等比性质: 教科书中说,在a/b=c/d=e/f=…=m/n中,当b+d+f+…+n≠0时,有1.等比性质成立的条件,万不忽略
Comparability properties: The textbook says that in a/b=c/d=e/f=...=m/n, when b+d+f+...+n≠0, there is a condition that the equal ratio property is established. Never ignore