试题:
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)]

答案:

我来补答
(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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