问题 解答题
计算下面各题,能简算的要简算.
(1)
4
9
×
1
5
÷
4
5
  
(2)(15-14×
4
7
)×
8
21

(3)
4
5
÷[(
1
3
+
2
5
)×
4
11
]
(4)
2
7
×
8
9
+
5
7
×
8
9
答案

(1)

4
9
×
1
5
÷
4
5

=

4
9
×
1
5
×
5
4

=

1
9

(2)(15-14×

4
7
)×
8
21

=(15-8)×

8
21

=7×

8
21

=

8
3

(3)

4
5
÷[(
1
3
+
2
5
)×
4
11
],

=

4
5
÷[
11
15
×
4
11
],

=

4
5
÷
4
15

=3;

(4)

2
7
×
8
9
+
5
7
×
8
9

=(

2
7
+
5
7
)×
8
9

=1×

8
9

=

8
9

多选题
单项选择题 A1/A2型题