8 加法 21 等于多少？

8 + 21 = 29

8加法21 等于 29

竖式演算

8+2129

验算

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

相关题目

8 + 20 = 28 8 + 22 = 30 8 + 19 = 27 8 + 23 = 31 8 + 24 = 32 8 + 18 = 26 8 + 25 = 33 8 + 17 = 25 7 + 21 = 28 9 + 21 = 30 6 + 21 = 27 10 + 21 = 31 11 + 21 = 32 5 + 21 = 26 12 + 21 = 33 4 + 21 = 25 1 + 28 = 29 2 + 27 = 29 3 + 26 = 29 4 + 25 = 29 5 + 24 = 29 6 + 23 = 29 2 + 63 = 65 32 + 63 = 95 30 + 56 = 86 30 + 53 = 83 10 + 60 = 70 9 + 60 = 69 75 - 46 = 29 52 - 23 = 29