11 加法 20 等于多少？

11 + 20 = 31

11加法20 等于 31

竖式演算

11+2031

验算

  • 用减法验算：31 − 20 = 11
  • 用减法验算：31 − 11 = 20

相关题目

11 + 19 = 30 11 + 21 = 32 11 + 22 = 33 11 + 18 = 29 11 + 23 = 34 11 + 17 = 28 11 + 24 = 35 11 + 16 = 27 10 + 20 = 30 12 + 20 = 32 13 + 20 = 33 9 + 20 = 29 14 + 20 = 34 8 + 20 = 28 15 + 20 = 35 7 + 20 = 27 1 + 30 = 31 2 + 29 = 31 3 + 28 = 31 4 + 27 = 31 5 + 26 = 31 6 + 25 = 31 45 + 100 = 145 21 + 36 = 57 10 + 23 = 33 10 + 77 = 87 34 + 52 = 86 61 + 28 = 89 45 - 14 = 31 49 - 18 = 31