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[洋葱] 2018广州25 固定角度求长度
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洋葱教研
GeoGebra
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三位數除以一位數(一)
兩組對邊相等和有直角的四邊形
拼砌四邊形
四邊形的特性
兩位數除以一位數(二)
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幾何鋪磚:正六邊形
乘法
第三冊2-2練習11
推移矩陣(y 方向)
轴对称的两点的动画演示.许兴华数学
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Differential Calculus
Differential Equation
Histogram
Square
Linear Programming or Linear Optimization