30 加法 21 等于多少？

30 + 21 = 51

30加法21 等于 51

竖式演算

30+2151

验算

  • 用减法验算：51 − 21 = 30
  • 用减法验算：51 − 30 = 21

相关题目

30 + 20 = 50 30 + 22 = 52 30 + 19 = 49 30 + 23 = 53 30 + 24 = 54 30 + 18 = 48 30 + 25 = 55 30 + 17 = 47 29 + 21 = 50 31 + 21 = 52 28 + 21 = 49 32 + 21 = 53 33 + 21 = 54 27 + 21 = 48 34 + 21 = 55 26 + 21 = 47 1 + 50 = 51 2 + 49 = 51 3 + 48 = 51 4 + 47 = 51 5 + 46 = 51 6 + 45 = 51 70 + 4 = 74 1 + 28 = 29 26 + 50 = 76 31 + 27 = 58 22 + 17 = 39 71 + 21 = 92 97 - 46 = 51 85 - 34 = 51