斯多摩

數是怎麼來的? / by: 庫法瑞; 斯多摩; 漢聲雜誌 (Language materials, printed)

圓 = Circles. / by: 斯多摩; 斯多摩哈利; 斯多摩敏黛爾; 烏斯帝 (Language materials, printed)

直線,線段,多邊形 / by: 奎肯布希; 斯多摩; 漢聲雜誌 (Language materials, printed)