题目内容

计算:
(1)(2.5×
4
5
)÷(
1
4
×0.8)-0.75÷
3
40

(2)1
4
17
×(2
2
3
-
3
4
)+
11
12
÷
17
21

(3)
7
18
×4.5+3.75÷16.2×2
1
5

(4)[1-(
1
12
+
1
15
)×4]÷(
3
10
÷
9
25
)
(1)(2.5×
4
5
)÷(
1
4
×0.8)-0.75÷
3
40

=2÷0.2-10,
=10-10,
=0;

(2)1
4
17
×(2
2
3
-
3
4
)+
11
12
÷
17
21

=
21
17
×
23
12
+
11
12
×
21
17

=(
23
12
+
11
12
)×
21
17

=
34
12
×
21
17

=
7
2


(3)
7
18
×4.5+3.75÷16.2×2
1
5

=1.75+
15
4
×
2
33
×
11
5

=1.75+0.5,
=2.25;


(4)[1-(
1
12
+
1
15
)×4]÷(
3
10
÷
9
25
)

=[1-
3
20
×4]÷
5
6

=[1-
3
5
5
6

=
2
5
÷
5
6

=
12
25
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