一、口算。
83 + 17 =
0.3 × 8 =
0.12 ÷ 3 =
9.4 × 2 =
92 ÷ 2 =
3.5 + 7.6 =
4.8 ÷ 48 =
2.7 × 60 =
205 ÷ 5 =
2.5 - 0.05 =
9.09 ÷ 9 =
602 × 4 =
1.76 × 5 =
7.22 - 3.56 =
840 ÷ 21 =
1.23 + 3.4 =
0.173 × 100 =
110 × 50 =
39.2 ÷ 8 =
2.68 + 1.42 =
3.6 ÷ 18 =
14.76 - 9.8 =
36 ÷ 15 =
4.06 × 50 =

1. 83 + 17 = 100
2. 0.3 × 8 = 2.4
3. 0.12 ÷ 3 = 0.04
4. 9.4 × 2 = 18.8
5. 92 ÷ 2 = 46
6. 3.5 + 7.6 = 11.1
7. 4.8 ÷ 48 = 0.1
8. 2.7 × 60 = 162
9. 205 ÷ 5 = 41
10. 2.5 - 0.05 = 2.45
11. 9.09 ÷ 9 = 1.01
12. 602 × 4 = 2408
13. 1.76 × 5 = 8.8
14. 7.22 - 3.56 = 3.66
15. 840 ÷ 21 = 40
16. 1.23 + 3.4 = 4.63
17. 0.173 × 100 = 17.3
18. 110 × 50 = 5500
19. 39.2 ÷ 8 = 4.9
20. 2.68 + 1.42 = 4.1
21. 3.6 ÷ 18 = 0.2
22. 14.76 - 9.8 = 4.96
23. 36 ÷ 15 = 2.4
24. 4.06 × 50 = 203

二、计算下面各题。
$0.6 + 6.4 ÷ 32$
$8.35 × 4 - 32.04$
$2.88 × (7.34 + 2.66)$
$(13 - 1.25) × 9$
$15.44 - 0.75 ÷ 5$
$(0.67 + 0.65) ÷ 22$

1. $0.6 + 6.4 ÷ 32 = 0.8$
2. $8.35 × 4 - 32.04 = 1.36$
3. $2.88 × (7.34 + 2.66) = 28.8$
4. $(13 - 1.25) × 9 = 105.75$
5. $15.44 - 0.75 ÷ 5 = 15.29$
6. $(0.67 + 0.65) ÷ 22 = 0.06$