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30度直角三角形
Author:
郭勇
GeoGebra
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【案例】2018年全国1卷理科12题
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
判斷球體
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Quiz on Polar Coordinates (1) 極坐標測驗1
Multiplication of Polynomials(多項式的乘法)
圆的面积展开的副本
圓周公式應用題2的副本
洋葱初中数学
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Differential Calculus
Addition
Arithmetic
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