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1983全国理11
Author:
常振虎
GeoGebra
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算柱 (兩位數)
【案例】2018年全国1卷理科12题
柱體建築師
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
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七巧板
Question 3
Tangent to a curve at a point
椭圆中的一个定值问题的动态演示.许兴华数学
开关灯游戏
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Quadratic Equations
Arithmetic
Circle
Piecewise Functions
Trapezoid