31 加法 9 等于多少？

31 + 9 = 40

31加法9 等于 40

竖式演算

131+940

验算

  • 用减法验算：40 − 9 = 31
  • 用减法验算：40 − 31 = 9

相关题目

31 + 8 = 39 31 + 10 = 41 31 + 11 = 42 31 + 7 = 38 31 + 12 = 43 31 + 6 = 37 31 + 13 = 44 31 + 5 = 36 30 + 9 = 39 32 + 9 = 41 29 + 9 = 38 33 + 9 = 42 28 + 9 = 37 34 + 9 = 43 35 + 9 = 44 27 + 9 = 36 1 + 39 = 40 2 + 38 = 40 3 + 37 = 40 4 + 36 = 40 5 + 35 = 40 6 + 34 = 40 81 + 62 = 143 36 + 7 = 43 44 + 94 = 138 78 + 51 = 129 24 + 82 = 106 49 + 21 = 70 41 - 1 = 40 78 - 38 = 40