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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
四邊形的特性
【案例】圆柱体内放置一个大球六个小球
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Triangular Number 三角形數
高美濕地風車2
conjugate
ie 5
练习
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Congruence
Parallelogram
Tree Diagrams
Isosceles Triangles
Median Line