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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