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直角梯形
Author:
Tse Sir
GeoGebra
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異分母分數減法
【案例】2013年安徽高考15题
兩位數除以一位數（一）
球體建築師
三位數除以一位數（二）
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Form 6(中六級)
练习及小结
三角形面積(由面積求高)
Αντιγραφή του Apollonius Problem gergonne 3
拋物線1--焦點法
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Sphere
Means
Volume
Differential Equation
Difference and Slope