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三角函數的性質
Author:
yuchengda
GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
異分母分數減法
四邊形的特性
Discover Resources
arithmetic operation
Projection01
数学几何
抛豆实验
乘法練習
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Secant Line or Secant
Piecewise Functions
Linear Programming or Linear Optimization
Upper and Lower Sum or Riemann Sum
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