精英家教网 > 小学数学 > 题目详情
(1)
4
13
+(
7
13
-
5
13
)
(2)
7
9
-
5
12
+
5
18
(3)
11
15
-(
4
5
-
4
3
)
(4)2
1
3
-(
1
6
+0.75)
(5)3.74+1
4
9
+2.26+1
5
9
(6)
15
14
×
21
10
÷
3
4
分析:本题要根据分数的加法、减法、乘法与除法的计算法则以及四则混合运算的运算顺序计算即可,其中“3.74+1
4
9
+2.26+1
5
9
”可据加法交换律及结合律进行计算.
解答:解:(1)
4
13
+(
7
13
-
5
13
)

=
4
13
+
2
13

=
6
13


(2)
7
9
-
5
12
+
5
18

=
28
36
-
15
36
+
10
36

=
23
36


(3)
11
15
-(
4
5
-
4
3
)

=
11
15
-(
12
15
-
20
15
)

=
11
15
-
12
15
+
20
15

=
19
15


(4)2
1
3
-(
1
6
+0.75)

=2
1
3
-(
1
6
+
3
4
)

=2
1
3
-(
2
12
+
9
12
)

=2
1
3
-
11
12

=
28
12
-
11
12

=
17
12


(5)3.74+1
4
9
+2.26+1
5
9

=(3.74+2.26)+(1
4
9
+1
5
9
)

=6+3,
=9;

(6)
15
14
×
21
10
÷
3
4

=
15
14
×
21
10
×
4
3

=3.
点评:完成有关于分数加减法的算式时要注意通分、约分,结果要化为最简分数.
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