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一、直接写出得数。(每题1分,共32分)
1.4+3.6=
1.15×0.5=
13.6-2.8=
4.7+2.5-1.8=
3.5+2.7=
0.28÷14=
15÷0.3=
1.5÷0.3×0.1=
2-1.3=
2.25×4=
8.4÷0.5=
0.3×0.2÷0.01=
0.7÷0.35=
72÷100=
0.23×0.4=
0.9×99+0.9=
66÷0.6=
2.7×0.5=
20.7÷3=
(9.8+1.2)÷0.5=
1.1×100=
0.08×1000=
9.2÷0.4=
8y÷2×0.3=
7x+2x=
4.3y-0.6y=
1.8d×2=
0.72÷0.08×100=
a-0.3a=
9y÷3=
4.8y×0.3y=
5.6c-0.8c÷0.8=
1.4+3.6=
5
1.15×0.5=
0.575
13.6-2.8=
10.8
4.7+2.5-1.8=
5.4
3.5+2.7=
6.2
0.28÷14=
0.02
15÷0.3=
50
1.5÷0.3×0.1=
0.5
2-1.3=
0.7
2.25×4=
9
8.4÷0.5=
16.8
0.3×0.2÷0.01=
6
0.7÷0.35=
2
72÷100=
0.72
0.23×0.4=
0.092
0.9×99+0.9=
90
66÷0.6=
110
2.7×0.5=
1.35
20.7÷3=
6.9
(9.8+1.2)÷0.5=
22
1.1×100=
110
0.08×1000=
80
9.2÷0.4=
23
8y÷2×0.3=
1.2y
7x+2x=
9x
4.3y-0.6y=
3.7y
1.8d×2=
3.6d
0.72÷0.08×100=
900
a-0.3a=
0.7a
9y÷3=
3y
4.8y×0.3y=
1.44y²
5.6c-0.8c÷0.8=
4.6c
答案
5 0.575 10.8 5.4 6.2 0.02 50 0.5 0.7 9 16.8 6 2 0.72 0.092 90 110 1.35 6.9 22 110 80 23 1.2y 9x 3.7y 3.6d 900 0.7a 3y 1.44y² 4.6c
二、用竖式计算,带☆的要验算。(每题3分,验算1分,共19分)
40×7.28=
0.21×18=
16.9÷0.13=
☆0.378÷0.12=
5.08×0.65=
3.53×1.7=
竖式及验算略
40×7.28=
291.2
0.21×18=
3.78
16.9÷0.13=
130
☆0.378÷0.12=
3.15
5.08×0.65=
3.302
3.53×1.7=
6.001
竖式及验算略
答案
291.2 3.78 130 3.15 3.302 6.001 竖式及验算略
解析
```
7.28
× 40
------
291.20
0.21
× 18
------
1.68
2.1
------
3.78
130
0.13)16.90
13
---
39
39
---
0
3.15
0.12)0.37.80
36
---
18
12
---
60
60
---
0
验算：
3.15
×0.12
------
630
315
------
0.3780
5.08
×0.65
------
2540
3048
------
3.3020
3.53
×1.7
------
2471
353
------
6.001
```
7.28
× 40
------
291.20
0.21
× 18
------
1.68
2.1
------
3.78
130
0.13)16.90
13
---
39
39
---
0
3.15
0.12)0.37.80
36
---
18
12
---
60
60
---
0
验算：
3.15
×0.12
------
630
315
------
0.3780
5.08
×0.65
------
2540
3048
------
3.3020
3.53
×1.7
------
2471
353
------
6.001
```
三、计算下面各题,能简算的要简算。(每题4分,共24分)
4.8+0.96÷1.2
3.6×3.4+6.6×3.6
78.5-(18.5+6.9)-3.1
0.35×1.25×2×0.8
4.76÷2.8×101-1.7
5.76÷[(3.4-2.8)×1.2]
4.8+0.96÷1.2
3.6×3.4+6.6×3.6
78.5-(18.5+6.9)-3.1
0.35×1.25×2×0.8
4.76÷2.8×101-1.7
5.76÷[(3.4-2.8)×1.2]
答案
5.6 36 50 0.7 170 8
解析
4.8+0.96÷1.2
=4.8+0.8
=5.6
3.6×3.4+6.6×3.6
=3.6×(3.4+6.6)
=3.6×10
=36
78.5-(18.5+6.9)-3.1
=78.5-18.5-6.9-3.1
=(78.5-18.5)-(6.9+3.1)
=60-10
=50
0.35×1.25×2×0.8
=(0.35×2)×(1.25×0.8)
=0.7×1
=0.7
4.76÷2.8×101-1.7
=1.7×101-1.7
=1.7×(101-1)
=1.7×100
=170
5.76÷[(3.4-2.8)×1.2]
=5.76÷[0.6×1.2]
=5.76÷0.72
=8
=4.8+0.8
=5.6
3.6×3.4+6.6×3.6
=3.6×(3.4+6.6)
=3.6×10
=36
78.5-(18.5+6.9)-3.1
=78.5-18.5-6.9-3.1
=(78.5-18.5)-(6.9+3.1)
=60-10
=50
0.35×1.25×2×0.8
=(0.35×2)×(1.25×0.8)
=0.7×1
=0.7
4.76÷2.8×101-1.7
=1.7×101-1.7
=1.7×(101-1)
=1.7×100
=170
5.76÷[(3.4-2.8)×1.2]
=5.76÷[0.6×1.2]
=5.76÷0.72
=8
