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相向而行的兩行進波
Author:
ipc Wang
f(x,t)=sin(3x-2t) g(x,t)=sin(3x+2t)
GeoGebra
New Resources
柱體建築師
球体的体积推导
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
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echen say
長方體的切割(一)
線段與弧所構成封閉區域的填塞問題
求一數是另一數的幾分之幾？
橢圓規Ellipsograph of Parallelogram
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Numbers
Means
Root
Linear Programming or Linear Optimization
Functions