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駐波:相向而行的兩行進波線性疊加而成
Author:
ipc Wang
y=sin(3x-2t) y=sin(3x+2t)
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
異分母分數減法
三位數除以一位數（一）
兩組對邊相等的四邊形
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多邊形的外角和
判斷柱體 4
Trigonometry
圓柱
國旗
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Symmetry
Parametric Curves
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