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一、口算。
$152 - 103 = $
$103 + 67 = $
$4500 ÷ 50 ÷ 9 = $
$720 ÷ 60 = $
$105 × 6 = $
$512 - 144 ÷ 12 = $
$64 - 38 = $
$220 ÷ 4 = $
$25 × (40 - 32) = $
$360 ÷ 12 = $
$32 × 5 = $
$126 ÷ 6 × 5 = $
$46 - 27 = $
$500 - 85 = $
$978 - (78 + 335) = $
$90 × 80 = $
$121 + 38 = $
$1500 ÷ (75 ÷ 3) = $
$185 ÷ 5 = $
$550 ÷ 11 = $
$26 × 25 × 4 = $
$130 × 30 = $
$85 + 25 = $
$45 × 16 × 2 = $
$455 ÷ 5 = $
$58 ÷ 2 = $
$32 × 2 × 5 = $
$600 × 90 = $
$70 × 27 = $
$(180 + 90) ÷ 9 = $
$152 - 103 = $
49
$103 + 67 = $
170
$4500 ÷ 50 ÷ 9 = $
10
$720 ÷ 60 = $
12
$105 × 6 = $
630
$512 - 144 ÷ 12 = $
500
$64 - 38 = $
26
$220 ÷ 4 = $
55
$25 × (40 - 32) = $
200
$360 ÷ 12 = $
30
$32 × 5 = $
160
$126 ÷ 6 × 5 = $
105
$46 - 27 = $
19
$500 - 85 = $
415
$978 - (78 + 335) = $
565
$90 × 80 = $
7200
$121 + 38 = $
159
$1500 ÷ (75 ÷ 3) = $
60
$185 ÷ 5 = $
37
$550 ÷ 11 = $
50
$26 × 25 × 4 = $
2600
$130 × 30 = $
3900
$85 + 25 = $
110
$45 × 16 × 2 = $
1440
$455 ÷ 5 = $
91
$58 ÷ 2 = $
29
$32 × 2 × 5 = $
320
$600 × 90 = $
54000
$70 × 27 = $
1890
$(180 + 90) ÷ 9 = $
30
答案
1. 49 2. 170 3. 10 4. 12 5. 630 6. 500 7. 26 8. 55 9. 200 10. 30 11. 160 12. 105 13. 19 14. 415 15. 565 16. 7200 17. 159 18. 60 19. 37 20. 50 21. 2600 22. 3900 23. 110 24. 1440 25. 91 26. 29 27. 320 28. 54000 29. 1890 30. 30
二、计算下面图形的面积。
答案
1. 35×44÷2=770(cm²) 2. （40÷2－12）×9= 72(cm²)
解析
1. $35×44÷2=770(\text{cm}^2)$
2. $(40÷2 - 12)×9=72(\text{cm}^2)$
2. $(40÷2 - 12)×9=72(\text{cm}^2)$
