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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