一、口算。(每题1分,共24分)
$8.65 + 7.34 = $ $15 - 7.8 = $ $1.75 - 0.9 = $
$8.4 - 0.03 = $ $5.6 + 4.4 = $ $15.3 + 0.64 = $
$7.65 - 0.57 = $ $20 - 6.18 = $ $8.25 + 7.36 = $
$5 - 4.2 = $ $9.27 - 1.3 = $ $2.9 - 0.01 = $
$0.02 + 0.18 = $ $46.26 - 26.1 = $ $3.2 + 8.2 = $
$10 + 5.6 = $ $8.64 + 2.7 = $ $6.2 - 6.12 = $
$13 + 5.7 = $ $5.1 - 3.06 = $ $3.72 + 1.28 = $
$12.85 - 3.6 = $ $3.94 + 0.06 = $ $3.6 - 1.2 = $

15.99 7.2 0.85 8.37 10 15.94 7.08 13.82 15.61 0.8 7.97 2.89 0.2 20.16 11.4 15.6 11.34 0.08 18.7 2.04 5 9.25 4 2.4

二、用竖式计算,带*的要验算。(第1、4题每题3分,其余每题4分,共22分)
$14.59 + 1.27$ $24.7 + 2.54$ *$9.1 - 2.36$
$10 - 5.72$ $12.74 - 9.58$ *$5.64 + 23.48$

15.86 27.24 6.74 4.28 3.16 29.12

1. $14.59 + 1.27 = 15.86$
```
14.59
+ 1.27
------
15.86
```
2. $24.7 + 2.54 = 27.24$
```
24.70
+ 2.54
------
27.24
```
3. $9.1 - 2.36 = 6.74$
```
9.10
2.36
------
6.74
```
验算：
```
6.74
+ 2.36
------
9.10
```
4. $10 - 5.72 = 4.28$
```
10.00
5.72
------
4.28
```
5. $12.74 - 9.58 = 3.16$
```
12.74
9.58
------
3.16
```
6. $5.64 + 23.48 = 29.12$
```
5.64
+23.48
------
29.12
```
验算：
```
23.48
+ 5.64
------
29.12
```

三、计算下面各题,怎样简便就怎样计算。(每题4分,共32分)
$(582 - 412)×24 + 325$ $0.75 + 57.88 + 2.25 + 0.12$
$43×141 + 43×58 + 43$ $52.87 - 17.75 - 12.25$
$[610 - (542 - 225)]×22$ $508 - 1128÷24 + 243$
$307 - 3600÷25÷4$ $3.47 + 5.92 + 6.53$

4405 61 8600 22.87 6446 704 271 15.92

1. $(582 - 412)×24 + 325$
$=170×24 + 325$
$=4080 + 325$
$=4405$
2. $0.75 + 57.88 + 2.25 + 0.12$
$=(0.75 + 2.25) + (57.88 + 0.12)$
$=3 + 58$
$=61$
3. $43×141 + 43×58 + 43$
$=43×(141 + 58 + 1)$
$=43×200$
$=8600$
4. $52.87 - 17.75 - 12.25$
$=52.87 - (17.75 + 12.25)$
$=52.87 - 30$
$=22.87$
5. $[610 - (542 - 225)]×22$
$=[610 - 317]×22$
$=293×22$
$=6446$
6. $508 - 1128÷24 + 243$
$=508 - 47 + 243$
$=461 + 243$
$=704$
7. $307 - 3600÷25÷4$
$=307 - 3600÷(25×4)$
$=307 - 3600÷100$
$=307 - 36$
$=271$
8. $3.47 + 5.92 + 6.53$
$=(3.47 + 6.53) + 5.92$
$=10 + 5.92$
$=15.92$