问题 解答题
计算下面各题,能简便计算的要简便计算.
1÷(1+
5
8
÷5)
1
2
+
1
6
)×(
1
3
-
1
4
14
25
×24+
14
25
5
7
×
5
9
+
4
9
÷
7
5
4-
10
21
÷
2
3
-
2
7
9
8
-
2
7
+
7
8
-
5
7
答案

(1)1÷(1+

5
8
÷5),

=1÷(1+

1
8
),

=1÷

9
8

=

8
9

(2)(

1
2
+
1
6
)×(
1
3
-
1
4
),

=

2
3
×
1
12

=

1
18

(3)

14
25
×24+
14
25

=

14
25
×(24+1),

=

14
25
×25,

=14;

(4)

5
7
×
5
9
+
4
9
÷
7
5

=

5
7
×
5
9
+
4
9
×
5
7

=

5
7
×(
5
9
+
4
9
),

=

5
7
×1,

=

5
7

(5)4-

10
21
÷
2
3
-
2
7

=4-

5
7
-
2
7

=4-(

5
7
+
2
7
),

=4-1,

=3;

(6)

9
8
-
2
7
+
7
8
-
5
7

=(

9
8
+
7
8
)-(
2
7
+
5
7
),

=2-1,

=1.

单项选择题
单项选择题