问题 解答题
下面各题怎样算简便就怎样算.
18
35
÷0.6×
2
3
5
17
÷9+
1
9
×
12
17
2-
6
13
÷
9
26
-
2
3
(15-14×
4
7
)×
8
21
       
  87×
3
86
4
5
÷[(
1
3
+
2
5
)×
4
11
].
答案

(1)

18
35
÷0.6×
2
3

=

18
35
×
5
3
×
2
3

=

4
7

(2)

5
17
÷9+
1
9
×
12
17

=

5
17
×
1
9
+
1
9
×
12
17

=

1
9
×(
5
17
+
12
17

=

1
9

(3)2-

6
13
÷
9
26
-
2
3

=2-

4
3
-
2
3

=2-(

4
3
+
2
3

=2-2

=0;

(4)(15-14×

4
7
)×
8
21
    

=(15-8)×

8
21
   

=7×

8
21
   

=

8
3

(5)87×

3
86

=(86+1)×

3
86

=86×

3
86
+
3
86

=3

3
86

(6)

4
5
÷[(
1
3
+
2
5
)×
4
11
]

=

4
5
÷[
11
15
×
4
11
]

=

4
5
÷
4
15

=3.

单项选择题
单项选择题