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一、直接写出得数。(每题1分,共32分)
4.7+2.3=
17.5-0.9=
6.2-1.9=
6.37×100×0.1=
5.1-1.6=
9.8+0.2=
3×2.5=
1.5÷0.03÷0.1=
3.6×100=
2.4-0.482=
4.9÷0.07=
9.6÷0.12÷8=
4.8÷0.1=
4×0.5=
3÷0.6=
5.2+1.4÷0.7=
7.2÷1.8=
169÷1.3=
8.4÷0.21=
2.2÷0.4×0.1=
1.2×0.06=
0.72×10=
10÷50=
x+8y-7y=
9.2k-3k=
8.3x+2.9x=
1.9c×5c=
7.5×(4y÷2)=
0.3n×4=
7.3h÷0.1=
5.2×40d=
(15+1.5)÷1.5=
4.7+2.3=
7
17.5-0.9=
16.6
6.2-1.9=
4.3
6.37×100×0.1=
63.7
5.1-1.6=
3.5
9.8+0.2=
10
3×2.5=
7.5
1.5÷0.03÷0.1=
500
3.6×100=
360
2.4-0.482=
1.918
4.9÷0.07=
70
9.6÷0.12÷8=
10
4.8÷0.1=
48
4×0.5=
2
3÷0.6=
5
5.2+1.4÷0.7=
7.2
7.2÷1.8=
4
169÷1.3=
130
8.4÷0.21=
40
2.2÷0.4×0.1=
0.55
1.2×0.06=
0.072
0.72×10=
7.2
10÷50=
0.2
x+8y-7y=
x+y
9.2k-3k=
6.2k
8.3x+2.9x=
11.2x
1.9c×5c=
9.5c²
7.5×(4y÷2)=
15y
0.3n×4=
1.2n
7.3h÷0.1=
73h
5.2×40d=
208d
(15+1.5)÷1.5=
11
答案
7 16.6 4.3 63.7 3.5 10 7.5 500 360 1.918 70 10 48 2 5 7.2 4 130 40 0.55 0.072 7.2 0.2 x+y 6.2k 11.2x 9.5c² 15y 1.2n 73h 208d 11
二、用竖式计算,带☆的要验算。(每题3分,验算各1分,共21分)
☆56.4-25.94=
4.5×0.72=
☆5.76÷1.8=
18.9+10.32=
1.55÷3.9≈
(得数保留两位小数)
☆3.7×0.016=
☆56.4-25.94=
30.46
4.5×0.72=
3.24
☆5.76÷1.8=
3.2
18.9+10.32=
29.22
1.55÷3.9≈
0.40
(得数保留两位小数)
☆3.7×0.016=
0.0592
答案
30.46 3.24 3.2 29.22 0.40 0.0592 竖式及验算略
解析
```
☆56.4 - 25.94 = 30.46
```
```
56.40
25.94
------
30.46
```
验算：
```
30.46
+ 25.94
------
56.40
```
```
4.5×0.72 = 3.24
```
```
4.5
×0.72
------
90
315
------
3.240
```
```
☆5.76÷1.8 = 3.2
```
```
3.2
1.8)5.7.6
5 4
----
36
36
----
0
```
验算：
```
1.8
×3.2
------
36
54
------
5.76
```
```
18.9 + 10.32 = 29.22
```
```
18.90
+ 10.32
------
29.22
```
```
1.55÷3.9≈0.40
```
```
0.397
3.9)1.5.500
1 17
----
380
351
----
290
273
----
17
```
```
☆3.7×0.016 = 0.0592
```
```
3.7
×0.016
------
222
37
------
0.0592
```
验算：
```
0.016
× 3.7
------
0112
048
------
0.0592
```
☆56.4 - 25.94 = 30.46
```
```
56.40
25.94
------
30.46
```
验算：
```
30.46
+ 25.94
------
56.40
```
```
4.5×0.72 = 3.24
```
```
4.5
×0.72
------
90
315
------
3.240
```
```
☆5.76÷1.8 = 3.2
```
```
3.2
1.8)5.7.6
5 4
----
36
36
----
0
```
验算：
```
1.8
×3.2
------
36
54
------
5.76
```
```
18.9 + 10.32 = 29.22
```
```
18.90
+ 10.32
------
29.22
```
```
1.55÷3.9≈0.40
```
```
0.397
3.9)1.5.500
1 17
----
380
351
----
290
273
----
17
```
```
☆3.7×0.016 = 0.0592
```
```
3.7
×0.016
------
222
37
------
0.0592
```
验算：
```
0.016
× 3.7
------
0112
048
------
0.0592
```
三、计算下面各题,能简算的要简算。(每题3分,共18分)
7.47÷0.6÷0.5
18.6-(8.6+2.32)-6.68
1.478÷0.4÷0.25-8.7
2.64×1.7-2.64×0.7
5.83×5.6+5.83×5.4-5.83
4.8×3.1+6.2×7.6
7.47÷0.6÷0.5
18.6-(8.6+2.32)-6.68
1.478÷0.4÷0.25-8.7
2.64×1.7-2.64×0.7
5.83×5.6+5.83×5.4-5.83
4.8×3.1+6.2×7.6
答案
24.9 1 6.08 2.64 58.3 62
解析
7.47÷0.6÷0.5
=7.47÷(0.6×0.5)
=7.47÷0.3
=24.9
18.6-(8.6+2.32)-6.68
=18.6-8.6-2.32-6.68
=(18.6-8.6)-(2.32+6.68)
=10-9
=1
1.478÷0.4÷0.25-8.7
=1.478÷(0.4×0.25)-8.7
=1.478÷0.1-8.7
=14.78-8.7
=6.08
2.64×1.7-2.64×0.7
=2.64×(1.7-0.7)
=2.64×1
=2.64
5.83×5.6+5.83×5.4-5.83
=5.83×(5.6+5.4-1)
=5.83×10
=58.3
4.8×3.1+6.2×7.6
=4.8×3.1+3.1×2×7.6
=4.8×3.1+3.1×15.2
=3.1×(4.8+15.2)
=3.1×20
=62
=7.47÷(0.6×0.5)
=7.47÷0.3
=24.9
18.6-(8.6+2.32)-6.68
=18.6-8.6-2.32-6.68
=(18.6-8.6)-(2.32+6.68)
=10-9
=1
1.478÷0.4÷0.25-8.7
=1.478÷(0.4×0.25)-8.7
=1.478÷0.1-8.7
=14.78-8.7
=6.08
2.64×1.7-2.64×0.7
=2.64×(1.7-0.7)
=2.64×1
=2.64
5.83×5.6+5.83×5.4-5.83
=5.83×(5.6+5.4-1)
=5.83×10
=58.3
4.8×3.1+6.2×7.6
=4.8×3.1+3.1×2×7.6
=4.8×3.1+3.1×15.2
=3.1×(4.8+15.2)
=3.1×20
=62
