57 加法 21 等于多少？

57 + 21 = 78

57加法21 等于 78

竖式演算

57+2178

验算

  • 用减法验算：78 − 21 = 57
  • 用减法验算：78 − 57 = 21

相关题目

57 + 20 = 77 57 + 22 = 79 57 + 19 = 76 57 + 23 = 80 57 + 24 = 81 57 + 18 = 75 57 + 25 = 82 57 + 17 = 74 56 + 21 = 77 58 + 21 = 79 55 + 21 = 76 59 + 21 = 80 60 + 21 = 81 54 + 21 = 75 61 + 21 = 82 53 + 21 = 74 1 + 77 = 78 2 + 76 = 78 3 + 75 = 78 4 + 74 = 78 5 + 73 = 78 6 + 72 = 78 3 + 35 = 38 10 + 41 = 51 57 + 40 = 97 24 + 63 = 87 72 + 1 = 73 21 + 46 = 67 85 - 7 = 78 93 - 15 = 78