题目内容

计算,能简算的要简算.
7
13
÷8+
1
8
×
6
13

11
23
×
7
9
÷
22
23

1
2
×
2
3
+
3
10

1
9
×[9÷(
1
9
×9)]
.
(1)
7
13
÷8+
1
8
×
6
13
,
=
7
13
×
1
8
+
1
8
×
6
13
,
=(
7
13
+
6
13
)×
1
8
,
=1×
1
8
,
=
1
8
;

(2)
11
23
×
7
9
÷
22
23
,
=
11
23
×
7
9
×
23
22

=
7
18
;

(3)
1
2
×
2
3
+
3
10
,
=
1
3
+
3
10
,
=
19
30
;

(4)
1
9
×[9÷(
1
9
×9)],
=
1
9
×[9÷1],
=
1
9
×9,
=1.
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