题目内容

计算下面各题,能简算的要简算.
2
13
×
5
9
+
4
9
×
2
13
=

5
12
×
7
9
×
4
5
=
(
3
8
+
4
7
)÷
1
56
=
23×
13
22
=
5
14
÷[
7
28
-(
1
4
+
2
7
)]=
(1)
2
13
×
5
9
+
4
9
×
2
13
,
=
2
13
×(
5
9
+
4
9
),
=
2
13
×1,
=
2
13
;

(2)
5
12
×
7
9
×
4
5
=
7
27
;

(3)(
3
8
+
4
7
)÷
1
56
,
=(
3
8
+
4
7
)×56,
=
3
8
×56+
4
7
×56,
=21+32,
=53;

(4)23×
13
22
,
=(22+1)×
13
22
,
=22×
13
22
+1×
13
22
,
=13+
13
22
,
=13
13
22
;

(5)
5
14
÷[
7
28
-(
1
4
+
2
7
)],
=
5
14
÷[
7
28
-
7
28
-
2
7
],
=
5
14
÷[-
2
7
],
=-
5
14
×
7
2
,
=-
5
4
.
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