30 减法 9 等于多少？

30 - 9 = 21

30减法9 等于 21

竖式演算

21030-921

验算

  • 用加法验算：21 + 9 = 30

相关题目

30 - 8 = 22 30 - 10 = 20 30 - 11 = 19 30 - 7 = 23 30 - 12 = 18 30 - 6 = 24 30 - 13 = 17 30 - 5 = 25 29 - 9 = 20 31 - 9 = 22 28 - 9 = 19 32 - 9 = 23 27 - 9 = 18 33 - 9 = 24 34 - 9 = 25 26 - 9 = 17 22 - 1 = 21 23 - 2 = 21 24 - 3 = 21 25 - 4 = 21 26 - 5 = 21 27 - 6 = 21 93 - 64 = 29 42 - 16 = 26 22 - 4 = 18 91 - 18 = 73 75 - 36 = 39 42 - 23 = 19 3 × 7 = 21 1 × 21 = 21