1/2of 12  - 4-, 1/6 of 18 - 3 , 1/4 of 16 - 4`, 1/10 of 20 - 2, 1/5 of 20 - 4, 1/3 of 21 - 7, 1/3 of 12 - 4., 1/5 of 25 - 5`, 1/4 of 20 - 5, 1/6 of 24 - 4',

Fractions of a Set of Objects

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?