题目内容

简便运算
(1)13×
2
3
+0.34×
2
7
+13×
1
3
+
5
7
×0.34

(2)
1
3
+
3
4
+
2
5
+
5
7
+
7
8
+
9
20
+
10
21
+
11
24
+
19
35

(3)2009÷2009
2009
2010
(1)13×
2
3
+0.34×
2
7
+13×
1
3
+
5
7
×0.34,
=(13×
2
3
+13×
1
3
)+(0.34×
2
7
+
5
7
×0.34),
=(
2
3
+
1
3
)×13+(
2
7
+
5
7
)×0.34,
=1×13+1×0.34,
=13+0.34,
=13.34;

(2)
1
3
+
3
4
+
2
5
+
5
7
+
7
8
+
9
20
+
10
21
+
11
24
+
19
35

=
1
3
+
3
4
+
2
5
+
5
7
+
7
8
+(
1
5
+
1
4
)+(
1
3
+
1
7
)+(
1
3
+
1
8
)+(
12
35
+
7
35
),
=
1
3
+
3
4
+
2
5
+
5
7
+
7
8
+(
1
5
+
1
4
)+(
1
3
+
1
7
)+(
1
3
+
1
8
)+(
1
7
+
1
5
+
1
5
),
=
1
3
×3+(
3
4
+
1
4
)+(
2
5
+
1
5
×3)+(
5
7
+
1
7
×
2)+(
7
8
+
1
8
),
=1+1+1+1+1,
=5;

(3)2009÷2009
2009
2010

=2009÷
2009×2010+2009
2010

=2009÷
2009×(2010+1)
2010

=2009×
2010
2009×2011

=
2010
2011
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