题目内容

脱式计算:
1.8-0.48÷1.6 (
5
8
-
1
4
)×(
8
9
÷
4
15
)

2
9
÷[
5
6
×(
4
5
-
2
3
)]
(
4
5
+
3
7
7
9

(
7
12
-
3
8
+
2
3
1
24
[(8.7-7.5)÷0.2]×0.15.
分析:根据分数、小数的四则混合运算进行计算即可.
解答:解:(1)1.8-0.48÷1.6
=1.8-0.3,
=1.5;

(2)(
5
8
-
1
4
)×(
8
9
÷
4
15

=
3
8
×
10
3

=1
1
4


(3)(
4
5
+
3
7
)×
7
9

=
43
35
×
7
9

=
43
45


(4)
2
9
÷[
5
6
×(
4
5
-
2
3
)]
=
2
9
÷[
5
6
×
2
15
],
=
2
9
÷
1
9

=2;

(5)(
7
12
-
3
8
+
2
3
)÷
1
24

=(
5
24
+
2
3
)÷
1
24

=
21
24
÷
1
24

=21;

(6)[(8.7-7.5)÷0.2]×0.15
=[1.2÷0.2]×0.15,
=6×0.15,
=0.9.
点评:此题主要考查的是分数、小数的四则混合运算.
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