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| Ratio | |
| 作者姓名： | 刘晓玫 杨永良 |
| 摘 要： | Scale drawings,models,public utilities rates and taxes are some important applications of ratio, proportion and percentages in our daily lives.Now,let's first learn some knowledge about ratio. A ratio is a comparison of two quantities in the same units,say a and b given in a particular or- der.The ratio of a to b is written a:b.In order to have a good understanding of it,some exam- ples are followed. |
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