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20180407 同分母分數減法 TEST
Author:
makkei
GeoGebra
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兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
兩位數除以一位數（二）
三位數除以一位數（一）
画直线等分三角形的面积
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GGB風雲榜
P6 圓周02B
Measuring areas by placing different shapes
分數比較
圓心角
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Statistics
Isosceles Triangles
Pyramid
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