1. 直接写出得数。
1-0.37=
0.5+0.4=
6.9-3.6=
6+0.4-1.2=
6.7+3=
9.7-7=
0.76-0.5=
9.6-5+2.8=
3-1.2=
5.8-5=
5.6+0.33=
12-1.3+2.4=
4.5-1.5=
1-0.2=
3.21+0.5=
8.2+2.6+3.1=
2.8-1.2=
2-0.3=
4.35+1.9=
4.8+5.12+0.6=
8.2+2.6=
4.5+5.2=
6.33+2.11=
10.7+5.2-1.8=
4.8-1.2=
5.02+0.4=
8.39-6.27=
0.9-0.3+1.5=
14.3-9.4=
8.1-2.9=
4.91-0.08=
4.8-0.91+1.2=
1-0.37=
0.63
0.5+0.4=
0.9
6.9-3.6=
3.3
6+0.4-1.2=
5.2
6.7+3=
9.7
9.7-7=
2.7
0.76-0.5=
0.26
9.6-5+2.8=
7.4
3-1.2=
1.8
5.8-5=
0.8
5.6+0.33=
5.93
12-1.3+2.4=
13.1
4.5-1.5=
3
1-0.2=
0.8
3.21+0.5=
3.71
8.2+2.6+3.1=
13.9
2.8-1.2=
1.6
2-0.3=
1.7
4.35+1.9=
6.25
4.8+5.12+0.6=
10.52
8.2+2.6=
10.8
4.5+5.2=
9.7
6.33+2.11=
8.44
10.7+5.2-1.8=
14.1
4.8-1.2=
3.6
5.02+0.4=
5.42
8.39-6.27=
2.12
0.9-0.3+1.5=
2.1
14.3-9.4=
4.9
8.1-2.9=
5.2
4.91-0.08=
4.83
4.8-0.91+1.2=
5.09
答案
1. 0.63 0.9 3.3 5.2 9.7 2.7 0.26 7.4 1.8 0.8 5.93 13.1 3 0.8 3.71 13.9 1.6 1.7 6.25 10.52 10.8 9.7 8.44 14.1 3.6 5.42 2.12 2.1 4.9 5.2 4.83 5.09
2. 用竖式计算,带☆的要验算。
4.06+7.89=
☆6-0.51=
18.67-2.09=
40.8+90.73=
☆8.2-3.54=
9.85+1.7=
4.06+7.89=
11.95
☆6-0.51=
5.49
18.67-2.09=
16.58
40.8+90.73=
131.53
☆8.2-3.54=
4.66
9.85+1.7=
11.55
答案
2. 11.95 5.49 16.58 131.53 4.66 11.55 竖式及验算略
解析
```
4.06
+ 7.89
------
11.95
6.00
0.51
------
5.49
验算:
5.49
+ 0.51
------
6.00
18.67
2.09
------
16.58
40.80
+90.73
------
131.53
8.20
3.54
------
4.66
验算:
4.66
+ 3.54
------
8.20
9.85
+ 1.70
------
11.55
```
4.06
+ 7.89
------
11.95
6.00
0.51
------
5.49
验算:
5.49
+ 0.51
------
6.00
18.67
2.09
------
16.58
40.80
+90.73
------
131.53
8.20
3.54
------
4.66
验算:
4.66
+ 3.54
------
8.20
9.85
+ 1.70
------
11.55
```
3. 在○里填“>”“<”或“=”。
3.8+24.6
12.34-2.9
46.76-5.13
9.13+16.5
27.83-2.6-1.3
10.4+0.3-6.4
3.8+24.6
<
35.12+4.4412.34-2.9
<
8.7+5.146.76-5.13
>
13.47+20.629.13+16.5
>
24.16-7.227.83-2.6-1.3
<
27.83-2.6+1.310.4+0.3-6.4
=
10.4-6.4+0.3答案
3. < < > > < =
若$a= 0.\underbrace{00…0}_{2024个0}4$,$b= 0.\underbrace{00…0}_{2025个0}2$,则$a+b= $
$0.\underbrace{00…0}_{2024个0}42$
,$a-b= $$0.\underbrace{00…0}_{2024个0}38$
。答案
0.00…042 0.00…038 2024个0 2024个0
解析
$0.\underbrace{00…0}_{2024个0}42;$$0.\underbrace{00…0}_{2024个0}38$
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