30 加法 12 等于多少？

30 + 12 = 42

30加法12 等于 42

竖式演算

30+1242

验算

  • 用减法验算：42 − 12 = 30
  • 用减法验算：42 − 30 = 12

相关题目

30 + 11 = 41 30 + 13 = 43 30 + 10 = 40 30 + 14 = 44 30 + 15 = 45 30 + 9 = 39 30 + 16 = 46 30 + 8 = 38 29 + 12 = 41 31 + 12 = 43 28 + 12 = 40 32 + 12 = 44 33 + 12 = 45 27 + 12 = 39 34 + 12 = 46 26 + 12 = 38 1 + 41 = 42 2 + 40 = 42 3 + 39 = 42 4 + 38 = 42 5 + 37 = 42 6 + 36 = 42 60 + 27 = 87 53 + 15 = 68 55 + 32 = 87 62 + 5 = 67 13 + 66 = 79 33 + 46 = 79 77 - 35 = 42 99 - 57 = 42