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旋轉長方形
Author:
王廷祐
GeoGebra
New Resources
直角坐標平面上的旋轉變換
異分母分數減法
兩位數除以一位數（二）
画直线等分三角形的面积
拼砌四邊形
Discover Resources
二元线性规划的图解法(习题5)
pythLK
面積題 A
同心圓
線性估計(Linear Approximation)
Discover Topics
Rational Numbers
Calculus
Dilation
Difference and Slope
Algebra