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ctr to mid perd
Author:
FSS HCF
GeoGebra
New Resources
异形操场
双心四边形
第八周作业1
科氏力 (Coriolis Force)
盈利與虧蝕
Discover Resources
百分數：折扣、盈利與虧損
內切圓滾動有圖更新
平行四邊形
locus wrt two pts on two indep. circle
刘校安排（1）
Discover Topics
Frequency Distribution
Natural Numbers
Fractions
Right Triangles
Step Functions