1. 直接写出得数。(9分)
0.6 - 0.13 = 3.07 + 1.2 = 7.2 + 0.6 =
0.8 + 0.2 = 0.83 - 0.5 = 10.8 - 9 =
1 + 0.05 = 1 + 9.24 = 1.36 + 0.4 =
0.6 - 0.13 = 3.07 + 1.2 = 7.2 + 0.6 =
0.8 + 0.2 = 0.83 - 0.5 = 10.8 - 9 =
1 + 0.05 = 1 + 9.24 = 1.36 + 0.4 =
答案:1. 0.47 4.27 7.8 1 0.33 1.8 1.05 10.24 1.76
2. 用竖式计算,带*的要验算。(14分)
6.352 + 6.58 *9 - 3.892 62.4 - 12.53
38. 26 + 14.4 108.78 - 8.69 9.82 + 96.8
6.352 + 6.58 *9 - 3.892 62.4 - 12.53
38. 26 + 14.4 108.78 - 8.69 9.82 + 96.8
答案:2. 12.932 5.108 49.87 52.66 100.09 106.62 竖式及验算略
解析:
```
6.352
+ 6.580
------
12.932
9.000
3.892
------
5.108
验算:
5.108
+ 3.892
------
9.000
62.40
-12.53
------
49.87
38.26
+14.40
------
52.66
108.78
8.69
------
100.09
9.82
+96.80
------
106.62
```
6.352
+ 6.580
------
12.932
9.000
3.892
------
5.108
验算:
5.108
+ 3.892
------
9.000
62.40
-12.53
------
49.87
38.26
+14.40
------
52.66
108.78
8.69
------
100.09
9.82
+96.80
------
106.62
```
3. 用简便方法计算。(8分)
15.32 - 3.7 - 1.3 16.79 + 9.8 - 6.79
146.5 - (2.3 + 46.5) 0.83 + 0.79 + 0.17
15.32 - 3.7 - 1.3 16.79 + 9.8 - 6.79
146.5 - (2.3 + 46.5) 0.83 + 0.79 + 0.17
答案:3. 原式$=15.32-(3.7+1.3)=15.32-5=10.32$
原式$=16.79-6.79+9.8=10+9.8=19.8$
原式$=146.5-46.5-2.3=100-2.3=97.7$
原式$=0.83+0.17+0.79=1+0.79=1.79$
原式$=16.79-6.79+9.8=10+9.8=19.8$
原式$=146.5-46.5-2.3=100-2.3=97.7$
原式$=0.83+0.17+0.79=1+0.79=1.79$