51+9 = - 60, 85+5 = - 90, 60-2 = - 58, 31+9 = - 40, 40-8 =  - 32, 30-6 = - 24,

Zbrajanje i oduzimanje do 100

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?