题目内容

(1)
5
6
+
5
3
×
4
5
(2)
5
8
-
1
4
×(
8
9
÷
2
3
(3)(
1
2
-
1
6
)×
3
5
÷
1
5
(4)
1
6
÷
9
17
×(
3
4
+
2
3
(5)
11
12
-
1
4
+
3
10
÷
3
5
(6)
2
3
÷(
3
4
-
1
2
)×
4
5
分析:(1)先算乘法,再算加法;
(2)先算除法,再算乘法,最后算减法;
(3)先算减法,再算乘法,最后算除法;
(4)先算除法和加法,再算乘法;
(5)先算除法,再算减法,最后算加法;
(6)先算减法,再算除法,最后算乘法.
解答:解:
(1)
5
6
+
5
3
×
4
5

=
5
6
+
4
3

=
13
6


(2)
5
8
-
1
4
×(
8
9
÷
2
3
),
=
5
8
-
1
4
×
4
3

=
5
8
-
1
3

=
7
24


(3)(
1
2
-
1
6
)×
3
5
÷
1
5

=
1
3
×
3
5
÷
1
5

=
1
5
÷
1
5

=1;

(4)
1
6
÷
9
17
×(
3
4
+
2
3
),
=
17
54
×
17
12

=
289
648


(5)
11
12
-
1
4
+
3
10
÷
3
5

=
11
12
-
1
4
+
1
2

=
2
3
+
1
2

=
7
6


(6)
2
3
÷(
3
4
-
1
2
)×
4
5

=
2
3
÷
1
4
×
4
5

=
8
3
×
4
5

=
32
15
点评:考查了分数四则混合运算.注意运算顺序和运算法则,然后再进一步计算.
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