21 加法 3 等于多少？

21 + 3 = 24

21加法3 等于 24

竖式演算

21+324

验算

  • 用减法验算：24 − 3 = 21
  • 用减法验算：24 − 21 = 3

相关题目

21 + 2 = 23 21 + 4 = 25 21 + 1 = 22 21 + 5 = 26 21 + 6 = 27 21 + 7 = 28 21 + 8 = 29 21 + 9 = 30 20 + 3 = 23 22 + 3 = 25 19 + 3 = 22 23 + 3 = 26 24 + 3 = 27 18 + 3 = 21 25 + 3 = 28 17 + 3 = 20 1 + 23 = 24 2 + 22 = 24 3 + 21 = 24 4 + 20 = 24 5 + 19 = 24 6 + 18 = 24 2 + 13 = 15 31 + 61 = 92 25 + 64 = 89 32 + 10 = 42 80 + 4 = 84 35 + 10 = 45 75 - 51 = 24 81 - 57 = 24