题目内容

2
7
16
+1
3
16
          
9
7
8
-5
5
8
              
6-4
1
6
              
4
9
14
-3
9
2
5
-3
4
5
            
4
1
6
-2
2
3
          
1
3
4
-0.45+
2
5
           
3
5
6
+4.25-
5
8
2
1
6
+3.75-1
8
9
     
6.875+(4.5-1
2
3
)     
6.94-(4.94+1
3
7
)     
4
9
10
-1
4
5
-0.2.
分析:(1)、(2)、(3)、(4)、(5)、(6)是带分数的加减法,整数部分和分数部分分开进行加减;
(7)、(12)把分数化成小数再计算;
(8)、(9)、(10)、(12)把小数化成分数再计算;
(11)去掉括号后在计算.
解答:解:(1)2
7
16
+1
3
16

=(2+1)+(
7
16
+
3
16
),
=3+
5
8

=3
5
8


(2)9
7
8
-5
5
8

=(9-5)+(
7
8
-
5
8
),
=4+
1
4

=4
1
4


(3)6-4
1
6

=5+1-4
1
6

=(5-4)+(1-
1
6
),
=1+
5
6

=1
5
6


(4)4
9
14
-3,
=(4-3)+
9
14

=1+
9
14

=1
9
14


(5)9
2
5
-3
4
5

=8
7
5
-3
4
5

=(8-3)+(
7
5
-
4
5
),
=5+
3
5

=5
3
5


(6)4
1
6
-2
2
3

=3
7
6
-2
2
3

=(3-2)+(
7
6
-
2
3
),
=1+
1
2

=1
1
2


(7)1
3
4
-0.45+
2
5

=1.75-0.45+0.4,
=1.3+0.4,
=1.7;

(8)3
5
6
+4.25-
5
8

=3
5
6
+4
1
4
-
5
8

=(3+4)+(
5
6
+
1
4
-
5
8
),
=7+
11
24

=7
11
24


(9)2
1
6
+3.75-1
8
9

=2
1
6
+3
3
4
-1
8
9

=(2+3-1)+(
1
6
+
3
4
-
8
9
),
=4+
1
36

=4
1
36


(10)6.875+(4.5-1
2
3
),
=6
7
8
+4
1
2
-1
2
3

=(6+4-1)+(
7
8
+
1
2
-
2
3
),
=9+
17
24

=9
17
24


(11)6.94-(4.94+1
3
7
),
=6.94-4.94-1
3
7

=2-1
3
7

=2-1-
3
7

=1-
3
7

=
4
7


(12)4
9
10
-1
4
5
-0.2,
=4.9-1.8-0.2,
=3.1-0.2,
=2.9.
点评:带分数的加减法,整数部分加减整数部分,分数部分加减分数部分,分数部分不够减的,从整数部分拿出一个1来化成假分数,再进行加减,是小数的,先化成分数,再进行计算.
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