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Ex.3

Author:johnmayhk

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sanjiaohanshu
兩組對邊相等和有直角的四邊形
拼砌四邊形
近似值：有效數字
判斷球體

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固定周界的長方形的面積變化
分數與小數
厚會聚透鏡 Thick Convergent Lens
尺规作图
分数减法 Fraction Subtraction

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Secant Line or Secant
Quadratic Functions
Angles
Trigonometry
Natural Numbers

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