1. 直接写出得数。
0.8+1.2=
9.6-2.5=
0.5+0.9=
2.2+1.8-3=
4.3-0.7=
8.8-0.2=
3.84-1.7=
4.3+1.6-2.2=
1.2+1.8=
3.4+1.4=
0.52+0.3=
7.8+2.9+1.1=
5.6-0.4=
4.8+1.3=
0.75+1.4=
5.8+1.3-1.1=
0.3+1.54=
3.5+2.6=
0.5+0.35=
9-2.5-1.3=
0.8+0.15=
7.4+0.7=
32.8-1.8=
8.6+2.9-1.7=
0.49-0.09=
1-0.01=
9.5-3.52=
10-0.1+0.3=
1.92-0.09=
0.8+0.07=
3.5-0.78=
1.9+0.3-0.5=
0.8+1.2=
2
9.6-2.5=
7.1
0.5+0.9=
1.4
2.2+1.8-3=
1
4.3-0.7=
3.6
8.8-0.2=
8.6
3.84-1.7=
2.14
4.3+1.6-2.2=
3.7
1.2+1.8=
3
3.4+1.4=
4.8
0.52+0.3=
0.82
7.8+2.9+1.1=
11.8
5.6-0.4=
5.2
4.8+1.3=
6.1
0.75+1.4=
2.15
5.8+1.3-1.1=
6
0.3+1.54=
1.84
3.5+2.6=
6.1
0.5+0.35=
0.85
9-2.5-1.3=
5.2
0.8+0.15=
0.95
7.4+0.7=
8.1
32.8-1.8=
31
8.6+2.9-1.7=
9.8
0.49-0.09=
0.4
1-0.01=
0.99
9.5-3.52=
5.98
10-0.1+0.3=
10.2
1.92-0.09=
1.83
0.8+0.07=
0.87
3.5-0.78=
2.72
1.9+0.3-0.5=
1.7
答案
2 7.1 1.4 1
3.6 8.6 2.14 3.7
3 4.8 0.82 11.8
5.2 6.1 2.15 6
1.84 6.1 0.85 5.2
0.95 8.1 31 9.8
0.4 0.99 5.98 10.2
1.83 0.87 2.72 1.7
3.6 8.6 2.14 3.7
3 4.8 0.82 11.8
5.2 6.1 2.15 6
1.84 6.1 0.85 5.2
0.95 8.1 31 9.8
0.4 0.99 5.98 10.2
1.83 0.87 2.72 1.7
2. 用竖式计算,带☆的要验算。
13.8+9.76=
50.68-41.2=
☆20-12.79=
6.7+10.67=
☆12.37-4.82=
100.3-2.67=
竖式及验算略
13.8+9.76=
23.56
50.68-41.2=
9.48
☆20-12.79=
7.21
6.7+10.67=
17.37
☆12.37-4.82=
7.55
100.3-2.67=
97.63
竖式及验算略
答案
23.56 9.48 7.21
17.37 7.55 97.63
竖式及验算略
17.37 7.55 97.63
竖式及验算略
3. 改错。

答案
(1)2.7,3.4,4.1,(
(2)9.5,8.4,7.3,6.2,(
(3)2.2,7.2,12.2,(
4.8
),(5.5
)。(2)9.5,8.4,7.3,6.2,(
5.1
),(4
)。(3)2.2,7.2,12.2,(
17.2
),22.2,(27.2
)。答案
(1)4.8 5.5
(2)5.1 4
(3)17.2 27.2
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