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最小周長
Author:
張丰耘
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
拼砌四邊形
異分母分數減法
近似值：有效數字
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減法運算
假的龍珠
梯形堆垛
雙曲線代數性質,光學性質
空间立方体
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Similarity Transformation or Similarity
Differential Calculus
Tree Diagrams
Difference and Slope
Ratios