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解三角形（１）
Author:
蔡永志
Topic:
Triangles
,
Trigonometry
解三角形
GeoGebra
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兩組對邊相等和有直角的四邊形
湖南省张毅郴数字教研工作室 logo
美國國旗 (Codex 版)
判斷球體
近似值：有效數字
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ie 6
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