题目内容

怎样简便就怎样算.
56×(
5
7
-
3
8
)             

7
8
-
7
8
×
5
14
)÷
5
16
2
9
÷[
8
21
×(
1
3
+
2
15
)]
5
8
÷
7
9
÷
9
7
(1)56×(
5
7
-
3
8
),
=56×
5
7
-56×
3
8

=40-21,
=19;

(2)(
7
8
-
7
8
×
5
14
)÷
5
16

=(
7
8
-
5
16
)÷
5
16

=
9
16
×
16
5

=
9
5


(3)
2
9
÷[
8
21
×(
1
3
+
2
15
)],
=
2
9
÷[
8
21
×
7
15
],
=
2
9
÷
8
45

=
2
9
×
45
8

=
5
4


(4)
5
8
÷
7
9
÷
9
7

=
5
8
×
9
7
×
7
9

=
5
8
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