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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
三位數除以一位數（一）
異分母分數減法
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
第八周作业
Discover Resources
waaachen
量度活動所用的時間 (時、分)
雙曲線尺規作圖01
Math Project
面積2
Discover Topics
Statistics
Circle
Mode
Geometric Mean
Vectors 2D (Two-Dimensional)