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[洋葱] 2018广州25 求轨迹的长
Author:
洋葱教研
GeoGebra
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探究三角形的全等條件
画直线等分三角形的面积
圓周公式的應用
垂直線的斜率
第八周作业
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同心圓和線段-3(線段到最外圓有小圓)
gjc091b18 圓的割線
金惠吉：光的反射与折射
任務4的副本
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Right Triangles
Sphere
Congruence
Indefinite Integral
LCM and GCD
