3 加法 9 等于多少？

3 + 9 = 12

3加法9 等于 12

竖式演算

13+912

验算

  • 用减法验算：12 − 9 = 3
  • 用减法验算：12 − 3 = 9

相关题目

3 + 8 = 11 3 + 10 = 13 3 + 11 = 14 3 + 7 = 10 3 + 12 = 15 3 + 6 = 9 3 + 13 = 16 3 + 5 = 8 2 + 9 = 11 4 + 9 = 13 1 + 9 = 10 5 + 9 = 14 6 + 9 = 15 7 + 9 = 16 8 + 9 = 17 9 + 9 = 18 1 + 11 = 12 2 + 10 = 12 4 + 8 = 12 5 + 7 = 12 6 + 6 = 12 7 + 5 = 12 14 + 49 = 63 45 + 91 = 136 26 + 64 = 90 28 + 25 = 53 68 + 19 = 87 49 + 44 = 93 3 × 4 = 12 78 - 66 = 12