问题 解答题
下面各题,怎样算简便就怎样算
2-
3
8
÷
7
16
-
1
7
5
9
×
5
6
-
4
9
÷
6
5
4
5
-
4
5
÷4
3
8
÷[(
1
2
-
1
3
3
10
]
答案

(1)2-

3
8
÷
7
16
-
1
7

=2-

6
7
-
1
7

=2-(

6
7
+
1
7
),

=2-1,

=1;

(2)

5
9
×
5
6
-
4
9
÷
6
5

=

5
9
×
5
6
-
4
9
×
5
6

=(

5
9
-
4
9
)×
5
6

=

1
9
×
5
6

=

5
54

(3)4÷

4
5
-
4
5
÷4,

=5-

1
5

=4

4
5

(4)

3
8
÷[(
1
2
-
1
3
)×
3
10
],

=

3
8
÷[
1
6
×
3
10
],

=

3
8
÷
1
20

=

15
2

单项选择题
听力题