1 加法 21 等于多少？

1 + 21 = 22

1加法21 等于 22

竖式演算

1+2122

验算

  • 用减法验算：22 − 21 = 1
  • 用减法验算：22 − 1 = 21

相关题目

1 + 20 = 21 1 + 22 = 23 1 + 19 = 20 1 + 23 = 24 1 + 24 = 25 1 + 18 = 19 1 + 25 = 26 1 + 17 = 18 2 + 21 = 23 3 + 21 = 24 4 + 21 = 25 5 + 21 = 26 6 + 21 = 27 7 + 21 = 28 8 + 21 = 29 9 + 21 = 30 2 + 20 = 22 3 + 19 = 22 4 + 18 = 22 5 + 17 = 22 6 + 16 = 22 7 + 15 = 22 72 + 17 = 89 40 + 6 = 46 4 + 75 = 79 12 + 26 = 38 14 + 33 = 47 79 - 57 = 22 55 - 33 = 22 46 - 24 = 22