9 加法 12 等于多少？

9 + 12 = 21

9加法12 等于 21

竖式演算

19+1221

验算

  • 用减法验算：21 − 12 = 9
  • 用减法验算：21 − 9 = 12

相关题目

9 + 11 = 20 9 + 13 = 22 9 + 10 = 19 9 + 14 = 23 9 + 15 = 24 9 + 9 = 18 9 + 16 = 25 9 + 8 = 17 8 + 12 = 20 10 + 12 = 22 11 + 12 = 23 7 + 12 = 19 12 + 12 = 24 6 + 12 = 18 13 + 12 = 25 5 + 12 = 17 1 + 20 = 21 2 + 19 = 21 3 + 18 = 21 4 + 17 = 21 5 + 16 = 21 6 + 15 = 21 92 + 15 = 107 39 + 21 = 60 41 + 39 = 80 30 + 73 = 103 11 + 49 = 60 48 - 27 = 21 85 - 64 = 21 88 - 67 = 21