问题
解答题
|
答案
(1)2011
÷2011,2011 2012
=
×2011×2012+2011 2012
,1 2011
=
×2011×(2012+1) 2012
,1 2011
=
;2013 2012
(2)4.8×
+4.8÷3 7
,7 4
=4.8×
+4.8×3 7
,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
=
×1,13 17
=
;13 17
(4)2.28×17%+2.28×
+0.228×3.3,1 2
=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.