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S0E02

Author:张荣良

Topic:Area, Right Triangles

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近似值：有效數字
兩位數除以一位數（二）
兩位數加法
判斷球體
兩組對邊相等的四邊形

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海市蜃樓
Version 2
向量求和动画演示
以多維度解釋標準差
翰林數學_2下_CH4-3_四邊形的種類

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Trigonometry
Algebra
Straight Lines
Numbers
Volume

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