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平行四邊形面積
Author:
陳隆期
GeoGebra
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兩位數除以一位數（一）
兩位數除以一位數（二）
近似值：有效數字
拼砌四邊形
判斷球體
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等腰，角度关系
圖一
Building Cylinders 建造圓柱體
Problem1:(md+me+mf)/(ad+be+cf)=a
存款試算工具
Discover Topics
Definite Integral
Multiplication
Limits
Perimeter
Special Points