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齐欣老师的这篇文章,对等比的性质做了完善的叙述,颇有意义,如文末的练习题,答案竟有-1,可能是读者意想不到的.
This article by Qi Xin teacher makes a perfect narration of the nature of the ratio, which is quite meaningful. For example, if there is -1 in the final exercise, the reader may be unexpected.