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兩組對邊相等的四邊形
兩位數加法
兩位數除以一位數（二）
異分母分數減法
兩組對邊相等和有直角的四邊形
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圓形墊圈 (Washer)
自我練習
分線比值
seq,tra
小学一年级上（人教版）
Discover Topics
Subtraction
Matrices
Differential Equation
Secant Line or Secant
Numbers