题目内容

计算:
(1)(2.5×
5
8
)÷(
2
3
×0.8)-0.75÷
3
5

(2)1
3
4
×(2
4
5
-
1
1+2
)+
1
3
÷
1
1+3

(3)
1
4
×4.5+3.75÷16.2×2;
(4)[1-(
1
1+4
+
1
5
)×4]÷(
1
3
÷
1
4
(1)(2.5×
5
8
)÷(
2
3
×0.8)-0.75÷
3
5

=
25
16
÷
8
15
-0.75÷
3
5

=
25
16
÷
8
15
-1.25,
=
375
128
-1.25,
=
215
128


(2)1
3
4
×(2
4
5
-
1
1+2
)+
1
3
÷
1
1+3

=1
3
4
×
37
15
+
1
3
÷
1
4

=
259
60
+
4
3

=
339
60


(3)
1
4
×4.5+3.75÷16.2×2,
=1.125+
25
108
×2,
=1.125+
25
54

=
343
216


(4)[1-(
1
1+4
+
1
5
)×4]÷(
1
3
÷
1
4
),
=[1-
2
5
×4]÷
4
3

=[1-
8
5
4
3

=-
3
5
÷
4
3

=-
9
20
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