题目内容

计算下面各题,能简算的要简算.
(1)
4
9
×
1
5
÷
4
5
  
(2)(15-14×
4
7
)×
8
21

(3)
4
5
÷[(
1
3
+
2
5
)×
4
11
]
(4)
2
7
×
8
9
+
5
7
×
8
9
(1)
4
9
×
1
5
÷
4
5

=
4
9
×
1
5
×
5
4

=
1
9


(2)(15-14×
4
7
)×
8
21

=(15-8)×
8
21

=7×
8
21

=
8
3


(3)
4
5
÷[(
1
3
+
2
5
)×
4
11
],
=
4
5
÷[
11
15
×
4
11
],
=
4
5
÷
4
15

=3;

(4)
2
7
×
8
9
+
5
7
×
8
9

=(
2
7
+
5
7
)×
8
9

=1×
8
9

=
8
9
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