问题 解答题
怎样算简便就怎样算.
①9+8÷26+27÷39
②0.8×[13-(3.12+5.28)]
4
9
÷[
4
5
-(
1
3
-
1
5
)]
6
17
+(
13
14
+
13
17
)×
11
13
+
3
14
答案

①9+8÷26+27÷39,

=9+

8
26
+
27
39

=9+

4
13
+
9
13

=9+(

4
13
+
9
13
),

=10;

②0.8×[13-(3.12+5.28)],

=0.8×[13-8.4],

=0.8×4.6,

=3.68;

4
9
÷[
4
5
-(
1
3
-
1
5
)],

=

4
9
÷[
4
5
+
1
5
-
1
3
],

=

4
9
÷
2
3

=

4
9
×
3
2

=

2
3

6
17
+(
13
14
+
13
17
)×
11
13
+
3
14

=

6
17
+
13
14
×
11
13
+
13
17
×
11
13
+
3
14

=

6
17
+
11
14
+
11
17
+
3
14

=(

6
17
+
11
17
)+(
11
14
+
3
14
),

=1+1,

=2.

单项选择题
单项选择题