21 加法 8 等于多少？

21 + 8 = 29

21加法8 等于 29

竖式演算

21+829

验算

  • 用减法验算：29 − 8 = 21
  • 用减法验算：29 − 21 = 8

相关题目

21 + 7 = 28 21 + 9 = 30 21 + 6 = 27 21 + 10 = 31 21 + 11 = 32 21 + 5 = 26 21 + 12 = 33 21 + 4 = 25 20 + 8 = 28 22 + 8 = 30 19 + 8 = 27 23 + 8 = 31 24 + 8 = 32 18 + 8 = 26 25 + 8 = 33 17 + 8 = 25 1 + 28 = 29 2 + 27 = 29 3 + 26 = 29 4 + 25 = 29 5 + 24 = 29 6 + 23 = 29 85 + 10 = 95 50 + 31 = 81 2 + 97 = 99 12 + 83 = 95 32 + 31 = 63 17 + 62 = 79 37 - 8 = 29 89 - 60 = 29