题目内容

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.
(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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