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三角形內角和為180度

Author:范欣茹

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兩位數加法
三位數除以一位數（一）
找出對稱軸
兩組對邊相等的四邊形
拼砌四邊形

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軌跡,摺紙,滾動,實驗觀察,曲線
與三個半圓相切之圓的填滿
barara magic stick
导数
多动点运动

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Perimeter
Binomial Distribution
Multiplication
Variance
Trapezoid

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