题目内容

(2012?团风县模拟)
(1)27+18=
45
45
     
(2)60-14=
46
46
     
(3)21.7+3=
24.7
24.7
     
(4)15-0.4=
14.6
14.6
(5)1.2×0.3=
0.36
0.36
  
(6)24.8÷4=
6.2
6.2
   
(7)
1
9
+
1
3
=
4
9
=
4
9
       
(8)
7
8
-
1
8
=
3
4
=
3
4
(9)
2
3
×
3
4
=
1
2
1
2
     
(10)
3
5
÷
3
4
=
4
5
4
5
   
(11)
1
3
+
1
4
=
7
12
=
7
12
       
(12)
1
3
-
1
5
=
2
15
2
15
(13)
4
9
÷
2
3
=
2
3
=
2
3
      
(14)
1
2
+
3
4
=
5
4
=
5
4
        
(15)1.5×0=
0
0
       
(16)12÷
3
4
=
16
16
分析:(1)、(2)按整数的加减法法则运算;
(3)、(4)按小数的加减法法则运算;
(5)、(15)按小数的乘法法则运算;
(6)按小数除法法则运算;
(7)(8)(11)(12)(14)按分数的加减法法则运算,异分母的要先通分;
(9)按分数的乘法运算法则运算;
(10)(13)(16)按分数的乘法法则运算.
解答:解:
(1)27+18=45    (2)60-14=46   (3)21.7+3=24.7     
(4)15-0.4=14.6 (5)1.2×0.3=0.36  (6)24.8÷4=6.2
(7)
1
9
+
1
3
=
4
9
      
(8)
7
8
-
1
8
=
3
4
(9)
2
3
×
3
4
=
1
2
     
(10)
3
5
÷
3
4
=
4
5
   
(11)
1
3
+
1
4
=
7
12
       
(12)
1
3
-
1
5
=
2
15
(13)
4
9
÷
2
3
=
2
3
     
(14)
1
2
+
3
4
=
5
4
        
(15)1.5×0=0
(16)12÷
3
4
=16.
点评:注意:分数运算的最后结果要化成最简分数.
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