分解因子+倍数法！日常备的乘法速算技巧，提升计算效率50%
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|---|---|---|
| 脳5 | 鐩存帴鎶樺崐娣婚浂 | 68脳5=340 |
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| 脳25 | 鍏埫?00鍐嵜? | 44脳25=1100 |
| 脳99 | 鍏埫?00鍐嶅噺鑷繁 | 17脳99=1700-17=1683 |
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