2 加法 1 等于多少？

2 + 1 = 3

2加法1 等于 3

竖式演算

2+13

验算

  • 用减法验算：3 − 1 = 2
  • 用减法验算：3 − 2 = 1

相关题目

2 + 2 = 4 2 + 3 = 5 2 + 4 = 6 2 + 5 = 7 2 + 6 = 8 2 + 7 = 9 2 + 8 = 10 2 + 9 = 11 1 + 1 = 2 3 + 1 = 4 4 + 1 = 5 5 + 1 = 6 6 + 1 = 7 7 + 1 = 8 8 + 1 = 9 9 + 1 = 10 1 + 2 = 3 4 + 5 = 9 57 + 100 = 157 62 + 17 = 79 1 + 52 = 53 13 + 55 = 68 15 + 44 = 59 43 - 40 = 3 81 - 78 = 3 79 - 76 = 3 31 - 28 = 3 35 + 47 = 82 35 + 68 = 103 46 + 78 = 124