2 加法 21 等于多少？

2 + 21 = 23

2加法21 等于 23

竖式演算

2+2123

验算

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

相关题目

2 + 20 = 22 2 + 22 = 24 2 + 19 = 21 2 + 23 = 25 2 + 24 = 26 2 + 18 = 20 2 + 25 = 27 2 + 17 = 19 1 + 21 = 22 3 + 21 = 24 4 + 21 = 25 5 + 21 = 26 6 + 21 = 27 7 + 21 = 28 8 + 21 = 29 9 + 21 = 30 1 + 22 = 23 3 + 20 = 23 4 + 19 = 23 5 + 18 = 23 6 + 17 = 23 7 + 16 = 23 100 + 10 = 110 53 + 25 = 78 45 + 2 = 47 53 + 1 = 54 96 + 3 = 99 74 + 21 = 95 93 - 70 = 23 49 - 26 = 23