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dragon(龙)
Author:
赵林
GeoGebra
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三位數除以一位數（一）
【案例】2018年全国1卷理科12题
四邊形的特性
柱體建築師
兩組對邊相等和有直角的四邊形
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y=(x-1)^0.33+(x-3)^0.33+(x-5)^0.33
切線段等長
parallelogram and squares
Slope of a tangent 切線斜率
P.5 面積問題02
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Complex Numbers
Arithmetic Mean
Cone
Surface
Line Segment