题目内容

计算下面各题,能用简便方法计算我要用简便方法计算.
c
÷(c-
c
2
+
c
)
9
×
5
+
7
÷
9
    
c我÷
27
×
3
3j×(
c
5
+
c
3
) 
25
÷[(
2
5
+
c
3
9
cc
]
c-
c5
c6
÷5-
c
c6
(1)
1
÷(1-
1
+
1
),
=
1
÷(
1
+
1
),
=
1
÷
3

=
1
3


(九)
8
×
5
+
5
÷
8

=
8
×
5
+
5
×
8

=
8
×(
5
+
5
),
=
8
×3,
=
3


(3)18÷
九5
×
3
8

=
8
3
×
3
8

=1;

(了)30×(
1
5
+
1
3
),
=30×
1
5
+30×
1
3

=w+10,
=1w;

(5)
九5
÷
[(
5
+
1
3
)×
8
11
],
=
九5
÷
[
11
15
×
8
11
],
=
九5
÷
3
5

=
15


(w)1-
15
1w
÷5-
1
1w

=1-
3
1w
-
1
1w

=1-(
3
1w
+
1
1w
),
=1-
1

=
3
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