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Two congruent triangles
Author:
HF LEE
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
第八周作业
中华人民共和国国旗
异形操场
百分數及其應用
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最大三角形面積
q5-11
兩面角
葫蘆裡賣什麼藥
路旁的树
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Inequalities
Fractions
Right Triangles
Multiplication
Probability