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dragon(龙)
Author:
赵林
GeoGebra
New Resources
異分母分數減法
兩組對邊相等和有直角的四邊形
判斷球體
三位數除以一位數（一）
三位數除以一位數（二）
Discover Resources
function
Trigonometry
locus wrt two pts on two indep. circle
九點圓
黄金螺线与向日葵-朱老师
Discover Topics
Function Graph
Symmetry
Percentages
Area
Right Triangles