题目内容

下面各题,怎样简便就怎样算.
1÷(
1
3
+
3
4
)×
13
36
4
5
+
1
4
)÷
3
10
×
10
3
6.8×57+430×0.68
3
4
+
11
15
+
1
4
-
1
15
(1)1÷(
1
3
+
3
4
)×
13
36

=1÷
13
12
×
13
36

=
12
13
×
13
36

=
1
3


(2)(
4
5
+
1
4
)÷
3
10
×
10
3

=
21
20
÷
3
10
×
10
3

=
7
2
×
10
3

=
35
3


(3)6.8×57+430×0.68,
=6.8×57+43×6.8,
=6.8×(57+43),
=6.8×100,
=680;

(4)
3
4
+
11
15
+
1
4
-
1
15

=(
3
4
+
1
4
)+(
11
15
-
1
15
),
=1+
2
3

=1
2
3
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