雙面釘板(正方形+圓形)

SKU: M019
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SKU: M019 Category:

尺寸:14cm*14cm        材質:塑料

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

附橡皮筋

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