1. 直接写出得数。
3.8-1.9=
8.5-0.9=
2.4×0.6=
1.82×100÷2=
6.1+5.9=
8.5-1.3=
3.56÷0.2=
3.6÷0.12÷3=
1.8×20=
1.2÷0.6=
75÷0.75=
0.5+0.5÷0.5=
9.9÷0.3=
0.72÷0.9=
1.35×0.3=
8.5-0.5+1.7=
4.5×20=
3.9÷0.3=
0.81÷0.3=
1.5+0.75×2=
5×10.2=
1.6÷0.4=
0.43×200=
0.63÷2.1÷0.2=
0.43×100=
1.7×50=
0.56÷0.4=
2.8×0.1÷4=
3.6÷1.2=
6.8÷17=
0.75×0.6=
2.5×0.4×1.3=
3.8-1.9=
1.9
8.5-0.9=
7.6
2.4×0.6=
1.44
1.82×100÷2=
91
6.1+5.9=
12
8.5-1.3=
7.2
3.56÷0.2=
17.8
3.6÷0.12÷3=
10
1.8×20=
36
1.2÷0.6=
2
75÷0.75=
100
0.5+0.5÷0.5=
1.5
9.9÷0.3=
33
0.72÷0.9=
0.8
1.35×0.3=
0.405
8.5-0.5+1.7=
9.7
4.5×20=
90
3.9÷0.3=
13
0.81÷0.3=
2.7
1.5+0.75×2=
3
5×10.2=
51
1.6÷0.4=
4
0.43×200=
86
0.63÷2.1÷0.2=
1.5
0.43×100=
43
1.7×50=
85
0.56÷0.4=
1.4
2.8×0.1÷4=
0.07
3.6÷1.2=
3
6.8÷17=
0.4
0.75×0.6=
0.45
2.5×0.4×1.3=
1.3
答案
1. 1.9 7.6 1.44 91 12 7.2 17.8 10 36 2 100 1.5 33 0.8 0.405 9.7 90 13 2.7 3 51 4 86 1.5 43 85 1.4 0.07 3 0.4 0.45 1.3
2. 用竖式计算。
4.75+0.88=
0.43×2.8=
8.46×8.2≈
(得数保留一位小数)
5.22÷2.9=
1.197÷0.105=
183.6÷2.4≈
(得数保留整数)
4.75+0.88=
5.63
0.43×2.8=
1.204
8.46×8.2≈
69.4
(得数保留一位小数)
5.22÷2.9=
1.8
1.197÷0.105=
11.4
183.6÷2.4≈
77
(得数保留整数)
答案
2. 5.63 1.204 69.4 1.8 11.4 77 竖式略
解析
4.75+0.88=5.63
```
4.75
+ 0.88
------
5.63
```
0.43×2.8=1.204
```
0.43
× 2.8
------
344
86
------
1.204
```
8.46×8.2≈69.4
```
8.46
× 8.2
------
1692
6768
------
69.372
```
69.372≈69.4
5.22÷2.9=1.8
```
1.8
2.9)5.2.2
-2 9
------
2 32
-2 32
------
0
```
1.197÷0.105=11.4
```
11.4
0.105)1.1970
-1 05
------
147
-105
------
420
-420
------
0
```
183.6÷2.4≈77
```
76.5
2.4)183.6
-168
------
156
-144
------
120
-120
------
0
```
76.5≈77
```
4.75
+ 0.88
------
5.63
```
0.43×2.8=1.204
```
0.43
× 2.8
------
344
86
------
1.204
```
8.46×8.2≈69.4
```
8.46
× 8.2
------
1692
6768
------
69.372
```
69.372≈69.4
5.22÷2.9=1.8
```
1.8
2.9)5.2.2
-2 9
------
2 32
-2 32
------
0
```
1.197÷0.105=11.4
```
11.4
0.105)1.1970
-1 05
------
147
-105
------
420
-420
------
0
```
183.6÷2.4≈77
```
76.5
2.4)183.6
-168
------
156
-144
------
120
-120
------
0
```
76.5≈77
巧算:2.8×23.4+11.1×57.6+6.54×28。
答案
原式=2.8×(23.4+65.4)+11.1×57.6=2.8×88.8+11.1×57.6=2.8×8×11.1+11.1×57.6=(22.4+57.6)×11.1=80×11.1=888
解析
2.8×23.4+11.1×57.6+6.54×28
=2.8×23.4+6.54×28+11.1×57.6
=2.8×23.4+2.8×65.4+11.1×57.6
=2.8×(23.4+65.4)+11.1×57.6
=2.8×88.8+11.1×57.6
=2.8×8×11.1+11.1×57.6
=22.4×11.1+11.1×57.6
=(22.4+57.6)×11.1
=80×11.1
=888
=2.8×23.4+6.54×28+11.1×57.6
=2.8×23.4+2.8×65.4+11.1×57.6
=2.8×(23.4+65.4)+11.1×57.6
=2.8×88.8+11.1×57.6
=2.8×8×11.1+11.1×57.6
=22.4×11.1+11.1×57.6
=(22.4+57.6)×11.1
=80×11.1
=888
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