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乘法口诀
Author:
朱亮
GeoGebra
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【案例】2018年全国1卷理科12题
畫出對稱圖形
找出對稱軸
四邊形的特性
兩位數加法
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永遠垂直、以像素為單位的向量?
Functions
題5
兩直線的銳夾角
橢圓代數性質,光學性質,生活應用
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Arithmetic
Constructions
Polygons
Kite
Subtraction