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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
異分母分數減法
三位數除以一位數（一）
判斷球體
兩位數除以一位數（一）
Discover Resources
waaachen
海市蜃樓
Direct Variation (Different powers of x)
ctr to mid perd
언제부터인지 몰르겟는데 ..
Discover Topics
Trapezoid
Variance
Combinatorics
Cosine
Statistics