○: 88-29=59 驗算:59+29, 29+18=47 驗算:47-18, 71+28=99 驗算:99-28, 56-35=21 驗算:21+35, 60-28=32 驗算:32+28, ×: 50-24=26 驗算:50+26, 11+49=60 驗算:60+11, 76-28=48 驗算:76+28, 30-17=13 驗算:13+30, 30+21=51 驗算:51+30,

數學2上4_2用加減關係驗算

Leaderboard

Visual style

Mga Option

I-switch ang template

I-restore ang gi-autosave: ?