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Quiz on Solving Right Triangles (Finding Side Lengths) 解直角三角形：測驗1（求邊長）
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.gmath.hk
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sanjiaohanshu
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拼砌四邊形
異分母分數減法
四邊形的特性
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