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Mathin
Entry068Stage 3 · Grades 5–6数与代数

比例

表示两个比相等的式子:a∶b = c∶d。

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Definition

两个比相等,就组成比例3:4=9:123:4=9:12。比例的基本性质:两外项之积等于两内项之积。地图、模型、配方,都靠它保持「形状不变」。

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