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parabola, b varies, a, c fixed
Author:
perspect
GeoGebra
New Resources
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
第八周作业
拼砌四邊形
兩位數除以一位數（二）
Discover Resources
Bearings 方位
Is this a prism 11
填色
testing book
翰林數學_2下_CH4-3_梯形中線性質