问题 解答题
2011
2011
2012
÷
2011
4.8×
3
7
+4.8×÷
7
4
13
17
×
5
19
+
14
17
×
13
19
2.28×17%+2.28×
1
2
+0.228×3.3.
答案

(1)2011

2011
2012
÷2011,

=

2011×2012+2011
2012
×
1
2011

=

2011×(2012+1)
2012
×
1
2011

=

2013
2012

(2)4.8×

3
7
+4.8÷
7
4

=4.8×

3
7
+4.8×
4
7

=4.8×(

3
7
+
4
7
),

=4.8×1,

=4.8;

(3)

13
17
×
5
19
+
14
17
×
13
19

=

13
17
×
5
19
+
13
17
×
14
19

=

13
17
×(
5
19
+
14
19
),

=

13
17
×1,

=

13
17

(4)2.28×17%+2.28×

1
2
+0.228×3.3,

=2.28×0.17+2.28×0.5+2.28×0.33,

=2.28×(0.17+0.5+0.33),

=2.28×1,

=2.28.

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