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以「時」和「分」報時
Author:
GeoGebra Institute of Hong Kong
GeoGebra
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異分母分數減法
【案例】2018年全国1卷理科12题
三位數除以一位數（一）
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
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proof ASA
圖四
三角型
正n邊形的組合
Properties of Inequalities 不等式的加法與乘法性質
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Equilateral Triangles
Binomial Distribution
Trigonometry
Geometric Transformations
Subtraction