11 加法 9 等于多少？

11 + 9 = 20

11加法9 等于 20

竖式演算

111+920

验算

  • 用减法验算：20 − 9 = 11
  • 用减法验算：20 − 11 = 9

相关题目

11 + 8 = 19 11 + 10 = 21 11 + 11 = 22 11 + 7 = 18 11 + 12 = 23 11 + 6 = 17 11 + 13 = 24 11 + 5 = 16 10 + 9 = 19 12 + 9 = 21 13 + 9 = 22 9 + 9 = 18 14 + 9 = 23 8 + 9 = 17 15 + 9 = 24 7 + 9 = 16 1 + 19 = 20 2 + 18 = 20 3 + 17 = 20 4 + 16 = 20 5 + 15 = 20 6 + 14 = 20 80 + 20 = 100 41 + 67 = 108 65 + 82 = 147 97 + 80 = 177 68 + 18 = 86 8 + 69 = 77 97 - 77 = 20 2 × 10 = 20