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170821 三角形內角和
Author:
chuck.ncyu
GeoGebra
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直線的斜率
三位數除以一位數（一）
球体的体积推导
第八周作业
探究三角形的全等條件
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ray tracing 2 lens
國中數學
已知正三角形內部一點到三頂點距離求面積
地球儀
congruent triangle2_provided by Mr Yeung Kar Chun
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Exponent
Diagrams
Frequency Distribution
Cylinder
Set Theory