一、直接写出得数。(每题1分,共32分)
1.6+0.3=
3.4+5.2=
0.65÷0.13=
5.6÷0.7-3=
2.5-1.2=
2.6×10=
0.17×6=
3.9+4.8×0.1=
0.7-0.04=
0.27×3=
2.4÷0.06=
0.16÷0.2÷0.8=
1-0.68=
6.3÷90=
3.1×0.4=
0.9×0.7÷0.1=
9÷0.25=
1.3×0.8=
9.8÷0.7=
3.2-3.2÷4=
4.6×100=
75×0.4=
1.25×16=
4.2a+3.8a÷2=
0.6m+1.4m=
0.27a×a=
403x×0.1=
9.6x÷(4.8×2)=
0.7n×0.9n=
3.2n÷1.6=
a-0.16a=
0.6÷0.3×0.6×0.3=

1.9 8.6 5 5 1.3 26 1.02 4.38 0.66 0.81 40 1 0.32 0.07 1.24 6.3 36 1.04 14 2.4 460 30 20 6.1a 2m 0.27a² 40.3x x 0.63n² 2n 0.84a 0.36

二、用竖式计算,带☆的要验算。(每题3分,验算1分,共19分)
3.25÷2.5=
49.91÷6.2=
0.78×1.25≈
(保留一位小数)
0.37×2.8=
☆9.59÷1.4=
3.25×2.3=

1.3 8.05 1.0 1.036 6.85 7.475 竖式及验算略

```
1.3
2.5)3.2.5
2 5
---
75
75
---
0
8.05
6.2)49.9.1
49 6
---
310
310
---
0
0.78
×1.25
------
390
156
78
------
0.975≈1.0
0.37
×2.8
------
296
74
------
1.036
6.85
1.4)9.5.9
8 4
---
119
112
---
70
70
---
0
验算：
6.85
×1.4
------
2740
685
------
9.590
3.25
×2.3
------
975
650
------
7.475
```

三、计算下面各题,能简算的要简算。(每题4分,共24分)
102×28
0.6×2.4×2.5
48.6÷0.81-0.85×18
6.3×25+2.5×37
50.1÷1.5-45.6÷1.5
100.8÷[(10.79+6.49)÷4.8]

2856 3.6 44.7 250 3 28

102×28
=(100+2)×28
=100×28+2×28
=2800+56
=2856
0.6×2.4×2.5
=0.6×(2.4×2.5)
=0.6×6
=3.6
48.6÷0.81-0.85×18
=60-15.3
=44.7
6.3×25+2.5×37
=6.3×25+25×3.7
=(6.3+3.7)×25
=10×25
=250
50.1÷1.5-45.6÷1.5
=(50.1-45.6)÷1.5
=4.5÷1.5
=3
100.8÷[(10.79+6.49)÷4.8]
=100.8÷[17.28÷4.8]
=100.8÷3.6
=28