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VCChung
GeoGebra
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四邊形的特性
三位數除以一位數(一)
異分母分數減法
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
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龍騰4_1-1講段9
trapezium
地科模型–日照長短
test
折线匀速动点工具
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Calculus
Multiplication
Trigonometry
Logic
Tangent Line or Tangent