问题 解答题
用简便方法计算
(1)22×
55
56
+22×
1
56

(2)1+44×17÷11÷34
(3)(
5
7
-
2
3
)÷
5
21
×5
(4)2012÷2012
2012
2013
答案

(1)22×

55
56
+22×
1
56

=22

55
56
+
1
56

=22×1,

=22;

(2)1+44×17÷11÷34,

=1+44×17×

1
11
×
1
34

=1+2,

=3;

(3)(

5
7
-
2
3
)÷
5
21
×5,

=(

5
7
-
2
3
)×
21
5
×
5,

=

5
7
×21-
2
3
×21,

=15-14,

=1;

(4)2012÷2012

2012
2013

=2012÷

2012×2013+2012
2013

=2012÷

2012×(2013+1)
2013

=2012×

2013
2012×(2013+1)

=

2013
2013+1

=

2013
2014

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