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justin sin
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兩位數加法
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
兩位數除以一位數（一）
異分母分數減法
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圓與弦2
直角三角形斜邊上的高小於斜邊的一半
ghseh 二次函數描點法左右平移-2
test
圓滾動
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Calculus
Arithmetic Operations
Kite
Rotation
Unit Circle