题目内容

计算:
28-
8
9
÷
8
11
×
9
11
1
6
×
2
3
÷(
4
5
-
8
15
)
[1-(
1
4
+
3
8
)]÷
1
4
(
4
7
+
1
2
)×
7
25
.
28-
8
9
÷
8
11
×
9
11

=28-
8
9
×
11
8
×
9
11
,
=28-1,
=27;

1
6
×
2
3
÷(
4
5
-
8
15
)
=
1
9
×
15
4
,
=
5
12
;

[1-(
1
4
+
3
8
)]÷
1
4

=[1-
5
8
]×4,
=
3
8
×4,
=
3
2
;

(
4
7
+
1
2
)×
7
25

=
15
14
×
7
25
,
=
3
10
.
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