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平行四邊形的面積
Author:
whtong
GeoGebra
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算柱 (兩位數)
【案例】2018年全国1卷理科12题
異分母分數減法
兩組對邊相等的四邊形
判斷球體
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圓定理2.1
服务效率：服务水平公式及其与接通率公式的关联
z=sin(sqrt(x^2+y^2))
十分逼近法
二分法优化版（视频教程见https://www.bilibili.com/video/BV1ST4y1F78g）
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Statistics
Hyperbola
Congruence
Means
Upper and Lower Sum or Riemann Sum