题目内容

怎样算简便就怎样算.
103×25-4230÷30            
11
9
-
7
12
-
3
4
×
5
9
         
7
13
×
6
7
+
6
7
÷
13
6

30÷2.5-1÷
1
3

22÷(
2
3
-
1
7
)×20%
25÷[1÷(
1
10
-
3
100
)].
(1)103×25-4230÷30,
=2575-141,
=2434;

(2)
11
9
-
7
12
-
3
4
×
5
9

=
11
9
-
7
12
-
5
12

=
11
9
-(
7
12
+
5
12
),
=
11
9
-1,
=
2
9

       
(3)
7
13
×
6
7
+
6
7
÷
13
6

=
7
13
×
6
7
+
6
7
×
6
13

=(
7
13
+
6
13
)×
6
7

=1×
6
7

=
6
7


(4)30÷2.5-1÷
1
3

=12-3,
=9;

(5)22÷(
2
3
-
1
7
)×20%,
=22×
21
11
×0.2,
=42×0.2,
=8.4;

(6)25÷[1÷(
1
10
-
3
100
)],
=25÷[1÷
7
100
],
=25×
7
100

=
7
4
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