题目内容

计算下面各题,注意使用简便运算.
(1)
4
9
×
1
5
÷
4
5
(2)
4
5
÷
2
3
÷
5
6
(3)(15-14×
4
7
)×
8
21
(4)
2
7
×
8
9
+
5
7
×
8
9
(5)
4
5
÷[(
1
3
+
2
5
)×
4
11
]
(6)
7
5
-
5
8
-
9
16
÷
3
2
(1)
4
9
×
1
5
÷
4
5

=
4
9
×
1
5
×
5
4

=
1
9


(2)
4
5
÷
2
3
÷
5
6

=
4
5
×
3
2
×
6
5

=
36
25


(3)(15-14×
4
7
)×
8
21

=(15-8)×
8
21

=7×
8
21

=
8
3


(4)
2
7
×
8
9
+
5
7
×
8
9

=(
2
7
+
5
7
)×
8
9

=1×
8
9

=
8
9


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

=
4
5
×
15
4

=3;

(6)
7
5
-
5
8
-
9
16
÷
3
2

=
7
5
-
5
8
-
9
16
×
2
3

=
7
5
-
5
8
-
3
8

=
7
5
-(
5
8
+
3
8
),
=
7
5
-1,
=
2
5
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