9 加法 11 等于多少？

9 + 11 = 20

9加法11 等于 20

竖式演算

19+1120

验算

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

相关题目

9 + 10 = 19 9 + 12 = 21 9 + 13 = 22 9 + 9 = 18 9 + 14 = 23 9 + 8 = 17 9 + 15 = 24 9 + 7 = 16 8 + 11 = 19 10 + 11 = 21 11 + 11 = 22 7 + 11 = 18 12 + 11 = 23 6 + 11 = 17 13 + 11 = 24 5 + 11 = 16 1 + 19 = 20 2 + 18 = 20 3 + 17 = 20 4 + 16 = 20 5 + 15 = 20 6 + 14 = 20 25 + 35 = 60 86 + 41 = 127 8 + 67 = 75 24 + 80 = 104 74 + 53 = 127 35 + 38 = 73 28 - 8 = 20 90 - 70 = 20