登录
一、直接写出得数。(每题1分,共32分)
2.16-0.6=
8-1.52=
1.6×0.9=
7.5÷0.5-1.3=
4.1+2.4=
5.5÷0.5=
10.3÷0.1=
2.8×0.2÷0.1=
0.12×100=
4.7×0.1=
2÷8=
7.2÷40+0.02=
0.76÷4=
29.4÷0.7=
1.44÷0.4=
806×(3.2÷1.6)=
0.14×3=
2.6÷1.3=
2.5×40=
0.9×10+0.9=
8a×a=
6s-5s=
7y×5=
6+2c+3c=
7.5a+a=
10b-5b=
2.5c÷0.1=
2x+5x-3x=
15x-6x=
m+3m=
10a+0.1a=
4×xy+x=
2.16-0.6=
1.56
8-1.52=
6.48
1.6×0.9=
1.44
7.5÷0.5-1.3=
13.7
4.1+2.4=
6.5
5.5÷0.5=
11
10.3÷0.1=
103
2.8×0.2÷0.1=
5.6
0.12×100=
12
4.7×0.1=
0.47
2÷8=
0.25
7.2÷40+0.02=
0.2
0.76÷4=
0.19
29.4÷0.7=
42
1.44÷0.4=
3.6
806×(3.2÷1.6)=
1612
0.14×3=
0.42
2.6÷1.3=
2
2.5×40=
100
0.9×10+0.9=
9.9
8a×a=
8a²
6s-5s=
s
7y×5=
35y
6+2c+3c=
5c+6
7.5a+a=
8.5a
10b-5b=
5b
2.5c÷0.1=
25c
2x+5x-3x=
4x
15x-6x=
9x
m+3m=
4m
10a+0.1a=
10.1a
4×xy+x=
4xy+x
答案
1.56 6.48 1.44 13.7 6.5 11 103 5.6 12 0.47 0.25 0.2 0.19 42 3.6 1612 0.42 2 100 9.9 8a² s 35y 5c+6 8.5a 5b 25c 4x 9x 4m 10.1a 4xy+x
二、当m= 20时,计算下面各式。(每题2分,共12分)
113.7-m=
2m+5m=
4m×0.2=
5.8m-0.8m=
4.5m-0.5=
m-0.778+m÷4-9.222=
113.7-m=
93.7
2m+5m=
140
4m×0.2=
16
5.8m-0.8m=
100
4.5m-0.5=
89.5
m-0.778+m÷4-9.222=
15
答案
93.7 140 16 100 89.5 15
解析
113.7 - 20 = 93.7
2×20 + 5×20 = 140
4×20×0.2 = 16
5.8×20 - 0.8×20 = 100
4.5×20 - 0.5 = 89.5
20 - 0.778 + 20÷4 - 9.222 = 15
2×20 + 5×20 = 140
4×20×0.2 = 16
5.8×20 - 0.8×20 = 100
4.5×20 - 0.5 = 89.5
20 - 0.778 + 20÷4 - 9.222 = 15
三、用竖式计算,带☆的要验算。(每题3分,验算各1分,共20分)
58.24+9.98=
4.8×0.25=
☆7.86÷1.2=
7.83÷28≈
(得数保留两位小数)
☆5.02×2.6=
603.2÷5.8=
竖式及验算略
58.24+9.98=
68.22
4.8×0.25=
1.2
☆7.86÷1.2=
6.55
7.83÷28≈
0.28
(得数保留两位小数)
☆5.02×2.6=
13.052
603.2÷5.8=
104
竖式及验算略
答案
68.22 1.2 6.55 0.28 13.052 104 竖式及验算略
解析
```
58.24
+ 9.98
------
68.22
4.8
×0.25
------
240
96
------
1.20
6.55
1.2)7.8.60
7 2
---
66
60
---
60
60
---
0
验算：
6.55
×1.2
------
1310
655
------
7.860
0.279
28)7.830
5 6
---
223
196
---
270
252
---
18
≈0.28
5.02
×2.6
------
3012
1004
------
13.052
验算：
2.6
5.02)13.052
10 04
------
3012
3012
------
0
104
5.8)603.2
58
---
232
232
---
0
```
58.24
+ 9.98
------
68.22
4.8
×0.25
------
240
96
------
1.20
6.55
1.2)7.8.60
7 2
---
66
60
---
60
60
---
0
验算：
6.55
×1.2
------
1310
655
------
7.860
0.279
28)7.830
5 6
---
223
196
---
270
252
---
18
≈0.28
5.02
×2.6
------
3012
1004
------
13.052
验算：
2.6
5.02)13.052
10 04
------
3012
3012
------
0
104
5.8)603.2
58
---
232
232
---
0
```
四、计算下面各题,能简算的要简算。(每题3分,共18分)
18.7÷2.5÷4
4.87+3.95+5.13+6.05
5.98×10.9-0.9×5.98
(4.25÷2.5+3.7)×4.8
0.213×73+2.13×2.7
6.5×[(23.6-17.8)÷2.5]
18.7÷2.5÷4
4.87+3.95+5.13+6.05
5.98×10.9-0.9×5.98
(4.25÷2.5+3.7)×4.8
0.213×73+2.13×2.7
6.5×[(23.6-17.8)÷2.5]
答案
1.87 20 59.8 25.92 21.3 15.08
解析
18.7÷2.5÷4
=18.7÷(2.5×4)
=18.7÷10
=1.87
4.87+3.95+5.13+6.05
=(4.87+5.13)+(3.95+6.05)
=10+10
=20
5.98×10.9-0.9×5.98
=5.98×(10.9-0.9)
=5.98×10
=59.8
(4.25÷2.5+3.7)×4.8
=(1.7+3.7)×4.8
=5.4×4.8
=25.92
0.213×73+2.13×2.7
=2.13×7.3+2.13×2.7
=2.13×(7.3+2.7)
=2.13×10
=21.3
6.5×[(23.6-17.8)÷2.5]
=6.5×[5.8÷2.5]
=6.5×2.32
=15.08
=18.7÷(2.5×4)
=18.7÷10
=1.87
4.87+3.95+5.13+6.05
=(4.87+5.13)+(3.95+6.05)
=10+10
=20
5.98×10.9-0.9×5.98
=5.98×(10.9-0.9)
=5.98×10
=59.8
(4.25÷2.5+3.7)×4.8
=(1.7+3.7)×4.8
=5.4×4.8
=25.92
0.213×73+2.13×2.7
=2.13×7.3+2.13×2.7
=2.13×(7.3+2.7)
=2.13×10
=21.3
6.5×[(23.6-17.8)÷2.5]
=6.5×[5.8÷2.5]
=6.5×2.32
=15.08
