31 加法 20 等于多少？

31 + 20 = 51

31加法20 等于 51

竖式演算

31+2051

验算

  • 用减法验算：51 − 20 = 31
  • 用减法验算：51 − 31 = 20

相关题目

31 + 19 = 50 31 + 21 = 52 31 + 22 = 53 31 + 18 = 49 31 + 23 = 54 31 + 17 = 48 31 + 24 = 55 31 + 16 = 47 30 + 20 = 50 32 + 20 = 52 29 + 20 = 49 33 + 20 = 53 28 + 20 = 48 34 + 20 = 54 35 + 20 = 55 27 + 20 = 47 1 + 50 = 51 2 + 49 = 51 3 + 48 = 51 4 + 47 = 51 5 + 46 = 51 6 + 45 = 51 75 + 23 = 98 10 + 24 = 34 91 + 100 = 191 33 + 46 = 79 20 + 100 = 120 71 + 17 = 88 51 × 1 = 51 100 - 49 = 51