21 加法 2 等于多少？

21 + 2 = 23

21加法2 等于 23

竖式演算

21+223

验算

  • 用减法验算：23 − 2 = 21
  • 用减法验算：23 − 21 = 2

相关题目

21 + 1 = 22 21 + 3 = 24 21 + 4 = 25 21 + 5 = 26 21 + 6 = 27 21 + 7 = 28 21 + 8 = 29 21 + 9 = 30 20 + 2 = 22 22 + 2 = 24 19 + 2 = 21 23 + 2 = 25 24 + 2 = 26 18 + 2 = 20 25 + 2 = 27 17 + 2 = 19 1 + 22 = 23 2 + 21 = 23 3 + 20 = 23 4 + 19 = 23 5 + 18 = 23 6 + 17 = 23 65 + 20 = 85 51 + 13 = 64 43 + 20 = 63 6 + 52 = 58 40 + 24 = 64 2 + 26 = 28 89 - 66 = 23 90 - 67 = 23