8 加法 13 等于多少？

8 + 13 = 21

8加法13 等于 21

竖式演算

18+1321

验算

  • 用减法验算：21 − 13 = 8
  • 用减法验算：21 − 8 = 13

相关题目

8 + 12 = 20 8 + 14 = 22 8 + 11 = 19 8 + 15 = 23 8 + 10 = 18 8 + 16 = 24 8 + 17 = 25 8 + 9 = 17 7 + 13 = 20 9 + 13 = 22 6 + 13 = 19 10 + 13 = 23 11 + 13 = 24 5 + 13 = 18 12 + 13 = 25 4 + 13 = 17 1 + 20 = 21 2 + 19 = 21 3 + 18 = 21 4 + 17 = 21 5 + 16 = 21 6 + 15 = 21 17 + 28 = 45 38 + 28 = 66 16 + 29 = 45 14 + 58 = 72 77 + 41 = 118 8 + 62 = 70 71 - 50 = 21 96 - 75 = 21