题目内容

计算下面各题.
(
1
2
-
1
4
)×40
13×
3
4
+3÷
4
3
+
3
4
[2-(
1
3
+
8
5
)]÷
2
15
1
2
+(
3
7
×
1
6
÷
5
28
)
(
1
2
-
1
4
)÷(
1
2
+
1
4
)
36×[
2
3
-(
1
12
+
1
6
)]
(1)(
1
2
-
1
4
)×40
=
1
2
×
40-
1
4
×40
=20-10
=10;

(2)13×
3
4
+3÷
4
3
+
3
4

=(13+3+1)×
3
4

=17×
3
4

=12
3
4


(3)[2-(
1
3
+
8
5
)]÷
2
15

=[2-
29
15
]÷
2
15

=
1
15
÷
2
15

=
1
2


(4)
1
2
+(
3
7
×
1
6
÷
5
28

=
1
2
+(
1
14
÷
5
28

=
1
2
+
2
5

=
9
10


(5)(
1
2
-
1
4
)÷(
1
2
+
1
4

=
1
4
÷
3
4

=
1
3


(6)36×[
2
3
-(
1
12
+
1
6
)]

=36×[
2
3
-
1
4
].
=36×
2
3
-36×
1
4

=24-9
=15.
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