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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