4 + 4 + 4 = - 12, 1 + 1 + 1=  - 3, 5 + 5 + 5 = - 15, 3 + 3 + 3 = - 9, 7 + 7 = - 14, 7 + 7 + 7 = - 21, 2 + 2 + 2 = - 6, 10 + 10 + 10 = - 30, 0 + 0 + 0 = - 0, 6 + 6 + 6 = - 18,

Repeated Addition Practice

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?