100釘小釘板 (附橡皮圈)

SKU: M020
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SKU: M020 Category:

尺寸:16cm*16cm    顏色:藍色     材質:塑料   附橡筋

用橡皮圈在釘板上圍成所需的幾何模型

數方格個數可直觀地計算幾何圖形的面積

可教授面積,分數,時間等概念

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