题目内容

(2003?丰台区)
25+37= 21.7÷7=
3
5
×
5
12
=
25×
4
5
=
70-34= 12.3+=1.23=
1
4
-
1
5
=
11×
7
22
=
1.3+27= 1.05÷0.5=
3
8
=
4
9
÷2
=
45-0.5=
8
9
-
4
9
=
2
5
+
1
2
=
2
3
+
1
2
=
25×0.4=
2
7
+
3
7
=
1
6
×42
=
7
10
÷
7
13
=
分析:直接利用小数、分数的计算法则进行口算.
解答:
25+37=62 21.7÷7=3.1
3
5
×
5
12
=
1
4
25×
4
5
=20
70-34=36 12.3+=1.23=13.53
1
4
-
1
5
=
1
20
11×
7
22
=
7
2
1.3+27=28.3 1.05÷0.5=2.1
3
8
=16
4
9
÷2
=
2
9
45-0.5=44.5
8
9
-
4
9
=
4
9
2
5
+
1
2
=
9
10
2
3
+
1
2
=
7
6
25×0.4=10
2
7
+
3
7
=
5
7
1
6
×42
=7
7
10
÷
7
13
=
13
10
点评:此题主要考查小数、分数四则运算的口算能力.
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