题目内容

(1)
3
4
+25%÷(
2
3
-1.5×
1
3
)

(2)36×(
5
12
+
1
2
-
4
9
)

(3)(0.5-
1
3
)÷0.12×
2
75

(4)
1
2
+
2
3
×(
3
4
-
1
6
1
5

(5)
3
4
×[
7
16
+(
8
9
-
3
4
)]
分析:本题据四则混合运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;同时要注意分析式中数据,能简算的要简算.
解答:解:(1)
3
4
+25%÷(
2
3
-1.5×
1
3
)

=
3
4
+
1
4
÷(
2
3
-
3
2
×
1
3
),
=
3
4
+
1
4
÷
1
6

=
3
4
+
6
4

=
9
4

(2)36×(
5
12
+
1
2
-
4
9
)

=36×
5
12
+36×
1
2
-36×
4
9

=15+18-16,
=17;
(3)(0.5-
1
3
)÷0.12×
2
75

=(
1
2
-
1
3
÷
3
25
×
2
75

=
1
6
×
25
3
×
2
75

=
1
27

(4)
1
2
+
2
3
×(
3
4
-
1
6
1
5

=
1
2
+
2
3
×
7
12
×5,
=
1
2
+
35
18

=
22
9

(5)
3
4
×[
7
16
+(
8
9
-
3
4
)]

=
3
4
×[
7
16
+
5
36
],
=
3
4
×
83
144

=
83
192
点评:完成含有分数的四则混合运算要细心,注意通分、约分.
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