题目内容

计算.
(1)
9
10
÷[
1
2
×(
6
5
-
3
10
)]
(2)
8
13
÷7+
1
7
×
5
13

(3)(3.8-1.8÷2)×50%                         
(4)
2
3
+
1
3
×
9
14
+
11
14
(1)
9
10
÷[
1
2
×(
6
5
-
3
10
)],
=
9
10
÷[
1
2
×
9
10
],
=
9
10
÷
9
20

=
9
10
×
20
9

=2;

(2)
8
13
÷7+
1
7
×
5
13

=
8
13
×
1
7
+
1
7
×
5
13

=(
8
13
+
5
13
)×
1
7

=1×
1
7

=
1
7


(3)(3.8-1.8÷2)×50%,
=(3.8-0.9)×0.5,
=2.9×0.5,
=1.45;

(4)
2
3
+
1
3
×
9
14
+
11
14

=
2
3
+(
3
14
+
11
14
),
=
2
3
+1,
=1
2
3
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