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相反數
Author:
pingfeng.wu
Topic:
Fractions
國中數學7上：相反數
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兩組對邊相等的四邊形
算柱 (兩位數)
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）
異分母分數減法
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