一、直接写出得数。(每题1分,共32分)
0.4+2=
2.8-0.4=
0.75+1.5=
6.5+3.5+4.35=
2.2-1.1=
4.3-1.2=
0.8-0.34=
0.3-0.25-0.01=
3.2+1.5=
3.2-2.5=
1.01+9.9=
1.6+0.2+0.4=
10-3.4=
0.8+0.4=
4.6-1.5=
5-1.25-1.85=
4.9-0.7=
4.3-0.5=
8.7-0.49=
0.25+1.2+0.8=
16.8-5.4=
7.2-0.9=
7.6-0.18=
2.8+0.4-1.6=
2.8+1.3=
2.8+1.7=
2.08-1.9=
3.05+1.8-2.05=
6.7-0.9=
0.27-0.2=
7.2-1.83=
4.7-2.9+0.3=
0.4+2=
2.4
2.8-0.4=
2.4
0.75+1.5=
2.25
6.5+3.5+4.35=
14.35
2.2-1.1=
1.1
4.3-1.2=
3.1
0.8-0.34=
0.46
0.3-0.25-0.01=
0.04
3.2+1.5=
4.7
3.2-2.5=
0.7
1.01+9.9=
10.91
1.6+0.2+0.4=
2.2
10-3.4=
6.6
0.8+0.4=
1.2
4.6-1.5=
3.1
5-1.25-1.85=
1.9
4.9-0.7=
4.2
4.3-0.5=
3.8
8.7-0.49=
8.21
0.25+1.2+0.8=
2.25
16.8-5.4=
11.4
7.2-0.9=
6.3
7.6-0.18=
7.42
2.8+0.4-1.6=
1.6
2.8+1.3=
4.1
2.8+1.7=
4.5
2.08-1.9=
0.18
3.05+1.8-2.05=
2.8
6.7-0.9=
5.8
0.27-0.2=
0.07
7.2-1.83=
5.37
4.7-2.9+0.3=
2.1
答案
2.4 2.4 2.25 14.35 1.1 3.1 0.46 0.04 4.7 0.7 10.91 2.2 6.6 1.2 3.1 1.9 4.2 3.8 8.21 2.25 11.4 6.3 7.42 1.6 4.1 4.5 0.18 2.8 5.8 0.07 5.37 2.1
二、用竖式计算,带☆的要验算。(每题3分,验算各1分,共20分)
16.78+5.42=
20.17+14.84=
☆77.65-6.96=
☆30.7+40.68=
54-4.75=
100.8-10.96=
16.78+5.42=
22.2
20.17+14.84=
35.01
☆77.65-6.96=
70.69
☆30.7+40.68=
71.38
54-4.75=
49.25
100.8-10.96=
89.84
答案
822.2 35.01 70.69 71.38 49.25 89.84 竖式及验算略
解析
```
16.78
+ 5.42
------
22.20
20.17
+ 14.84
------
35.01
77.65
6.96
------
70.69
验算:
70.69
+ 6.96
------
77.65
30.70
+ 40.68
------
71.38
验算:
71.38
40.68
------
30.70
54.00
4.75
------
49.25
100.80
10.96
------
89.84
```
16.78
+ 5.42
------
22.20
20.17
+ 14.84
------
35.01
77.65
6.96
------
70.69
验算:
70.69
+ 6.96
------
77.65
30.70
+ 40.68
------
71.38
验算:
71.38
40.68
------
30.70
54.00
4.75
------
49.25
100.80
10.96
------
89.84
```
三、计算下面各题。(每题4分,共24分)
17.83-9.5+3.77
12.54-7.8+5.28
13.35-4.68+0.56
3.757-0.25+1.86
9.28+3.76+18.3
3.02-2.088+8.18
17.83-9.5+3.77
12.54-7.8+5.28
13.35-4.68+0.56
3.757-0.25+1.86
9.28+3.76+18.3
3.02-2.088+8.18
答案
12.1 10.02 9.23 5.367 31.34 9.112
解析
17.83-9.5+3.77=8.33+3.77=12.1
12.54-7.8+5.28=4.74+5.28=10.02
13.35-4.68+0.56=8.67+0.56=9.23
3.757-0.25+1.86=3.507+1.86=5.367
9.28+3.76+18.3=13.04+18.3=31.34
3.02-2.088+8.18=0.932+8.18=9.112
12.54-7.8+5.28=4.74+5.28=10.02
13.35-4.68+0.56=8.67+0.56=9.23
3.757-0.25+1.86=3.507+1.86=5.367
9.28+3.76+18.3=13.04+18.3=31.34
3.02-2.088+8.18=0.932+8.18=9.112
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