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Author:
李春培
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兩組對邊相等和有直角的四邊形
四邊形的特性
三位數除以一位數（一）
画直线等分三角形的面积
球體建築師
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trigonometry1
BEES定理2
Trigonometric Identities
ghk105b19 切線長度
Copy of 平行四邊形的面積
Discover Topics
Multiplication
Random Variables
Addition
Fractions
Symmetry