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 39 + 30 = 69 10 + 88 = 98 16 + 2 = 18 43 + 53 = 96 50 + 49 = 99 83 + 5 = 88 53 - 2 = 51 55 - 4 = 51