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一、口算。
$11 - 6 =$
$16 + 9 =$
$10 + 48 - 3 =$
$10 + 75 =$
$66 - 6 =$
$50 + 40 - 17 =$
$74 - 13 =$
$16 + 41 =$
$30 - 15 + 22 =$
$31 + 49 =$
$63 + 5 =$
$61 - 2 - 15 =$
$8 + 50 =$
$89 - 30 =$
$79 + 20 - 30 =$
$50 + 32 =$
$51 + 25 =$
$59 - 24 - 8 =$
$86 - 77 =$
$29 + 17 =$
$83 - 6 - 40 =$
$5 + 37 =$
$82 - 5 =$
$36 + 4 + 18 =$
$9 + 18 =$
$41 - 6 =$
$22 + 77 - 20 =$
$59 - 32 =$
$22 + 28 =$
$71 - 33 + 12 =$
$11 - 6 =$
$16 + 9 =$
$10 + 48 - 3 =$
$10 + 75 =$
$66 - 6 =$
$50 + 40 - 17 =$
$74 - 13 =$
$16 + 41 =$
$30 - 15 + 22 =$
$31 + 49 =$
$63 + 5 =$
$61 - 2 - 15 =$
$8 + 50 =$
$89 - 30 =$
$79 + 20 - 30 =$
$50 + 32 =$
$51 + 25 =$
$59 - 24 - 8 =$
$86 - 77 =$
$29 + 17 =$
$83 - 6 - 40 =$
$5 + 37 =$
$82 - 5 =$
$36 + 4 + 18 =$
$9 + 18 =$
$41 - 6 =$
$22 + 77 - 20 =$
$59 - 32 =$
$22 + 28 =$
$71 - 33 + 12 =$
答案
1. 5
2. 25
3. 55
4. 85
5. 60
6. 73
7. 61
8. 57
9. 37
10. 80
11. 68
12. 44
13. 58
14. 59
15. 69
16. 82
17. 76
18. 27
19. 9
20. 46
21. 37
22. 42
23. 77
24. 58
25. 27
26. 35
27. 79
28. 27
29. 50
30. 50
2. 25
3. 55
4. 85
5. 60
6. 73
7. 61
8. 57
9. 37
10. 80
11. 68
12. 44
13. 58
14. 59
15. 69
16. 82
17. 76
18. 27
19. 9
20. 46
21. 37
22. 42
23. 77
24. 58
25. 27
26. 35
27. 79
28. 27
29. 50
30. 50
二、找规律，填一填。
答案
90
51
29
25
7
16
2
51
29
25
7
16
2
