下面的题怎样简便就怎样算 81.2-11÷7-1/7×3 9/13÷8+1/8×7/13 6696÷62-6.5×10.6 [3/4-(5/6-2/3)]÷5/4.

问题描述:

下面的题怎样简便就怎样算    
81.2-11÷7-

1
7
×3        
9
13
÷8+
1
8
×
7
13
        
6696÷62-6.5×10.6
[
3
4
-(
5
6
-
2
3
)]÷
5
4

(1)81.2-11÷7-

1
7
×3,
=81.2-
11
7
-
3
7

=81.2-(
11
7
+
3
7
),
=81.2-2,
=79.2;
(2)
9
13
÷8+
1
8
×
7
13

=
9
13
×
1
8
+
1
8
×
7
13

=(
9
13
+
7
13
)×
1
8

=
16
13
×
1
8

=
2
13

(3)6696÷62-6.5×10.6,
=108-68.9,
=39.1;
(4)[
3
4
-(
5
6
-
2
3
)]÷
5
4

=[
3
4
-
1
6
5
4

=
7
12
×
4
5

=
7
15