一、口算。
$0.77 + 0.33 = $ $0.18 ÷ 0.2 = $ $1.9 × 4 × 0.5 = $
$7.28 ÷ 0.8 = $ $60 × 0.03 = $ $0.99 × 9 + 0.99 = $
$9 - 2.9 = $ $85.2 - 3.25 = $ $1.8 ÷ 4 ÷ 0.5 = $
$0.5 ÷ 100 = $ $2.8 × 0.4 = $ $1.5 - 1.5 × 0.2 = $
$12.6 ÷ 0.6 = $ $0.84 ÷ 0.06 = $ $1.5 ÷ 0.3 × 0.4 = $
$0.1 - 0.01 = $ $1.24 × 5 = $ $8.1 ÷ 3 × 2 = $
$5.1 ÷ 0.17 = $ $19.3 - 2.7 = $ $3 × 0.5 - 1 = $
$7.2 × 0.3 = $ $2.5 × 1.8 = $ $3.2 - 1.34 - 1.66 = $

一、1.1 0.9 3.8 9.1 1.8 9.9 6.1 81.95 0.9 0.005 1.12 1.2 21 14 2 0.09 6.2 5.4 30 16.6 0.5 2.16 4.5 0.2

$0.77 + 0.33 = 1.1$
$0.18 ÷ 0.2 = 0.9$
$1.9 × 4 × 0.5 = 3.8$
$7.28 ÷ 0.8 = 9.1$
$60 × 0.03 = 1.8$
$0.99 × 9 + 0.99 = 9.9$
$9 - 2.9 = 6.1$
$85.2 - 3.25 = 81.95$
$1.8 ÷ 4 ÷ 0.5 = 0.9$
$0.5 ÷ 100 = 0.005$
$2.8 × 0.4 = 1.12$
$1.5 - 1.5 × 0.2 = 1.2$
$12.6 ÷ 0.6 = 21$
$0.84 ÷ 0.06 = 14$
$1.5 ÷ 0.3 × 0.4 = 2$
$0.1 - 0.01 = 0.09$
$1.24 × 5 = 6.2$
$8.1 ÷ 3 × 2 = 5.4$
$5.1 ÷ 0.17 = 30$
$19.3 - 2.7 = 16.6$
$3 × 0.5 - 1 = 0.5$
$7.2 × 0.3 = 2.16$
$2.5 × 1.8 = 4.5$
$3.2 - 1.34 - 1.66 = 0.2$

二、用竖式计算。
$4.37 - 2.49$ $0.48 ÷ 3.2$ $1.82 × 0.45$
 
$1.48 + 2.59$ $3.5 × 2.58$ $54.61 ÷ 0.127$

二、1.88 0.15 0.819 4.07 9.03 430

```
4.37 - 2.49 = 1.88
4.37
2.49
------
1.88
0.48 ÷ 3.2 = 0.15
0.15
3.2)0.480
0.32
-----
0.160
0.160
-----
0
1.82 × 0.45 = 0.819
1.82
×0.45
-----
910
728
-----
0.8190
1.48 + 2.59 = 4.07
1.48
+ 2.59
------
4.07
3.5 × 2.58 = 9.03
2.58
× 3.5
-----
1290
774
-----
9.030
54.61 ÷ 0.127 = 430
430
0.127)54.610
508
-----
381
381
-----
0
```