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三角形三线合一
Author:
夜雨嘀嗒
GeoGebra
New Resources
正方形雪花图案
直線的斜率：水平變化 & 鉛垂變化
折扣
平行線的判定
活动三：应用性质
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waaachen
waaachen
長方形面積
閱讀鐘面及數字鐘（時和分）的副本
EnergyMath 2-3 棣美弗定理的副本
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Limits
Isosceles Triangles
Histogram
Derivative
Probability