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銳角三角：sin, cos
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
兩組對邊相等的四邊形
兩位數加法
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
Discover Resources
河內塔 1
Simple Interest and Compound Interest
雙曲與漸近線
電流急急棒棒
時鐘
Discover Topics
Arithmetic Mean
Real Numbers
Straight Lines
Square
Expected Value