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扩展：更多的除法技巧

Topics in 扩展：更多的除法技巧

Numbered in the order to learn them.

  1. 先乘后除（示例：被$5$除）

  2. 为了加快速度，尝试用“正确的顺序”分解出某个数的组成因子

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Type a concept, like “slope” or “photosynthesis”.

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