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perimeter

Author:ddcat0214, Anthony OR 柯志明

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兩組對邊相等和有直角的四邊形
異分母分數減法
兩位數除以一位數（一）
兩組對邊相等的四邊形
三位數除以一位數（二）

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proof50 劉邦佑
proof30黃煒皓
量角器2
Lesson 2 HW
Activity 2

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Addition
Real Numbers
Congruence
Circumcircle or Circumscribed Circle
Exponent

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