问题
解答题
脱式计算(注意能简算的一定要简算哟)
|
答案
(1)
×2013,2011 2012
=
×(2012+1),2011 2012
=
×2012+2011 2012
×1,2011 2012
=2011+
,2011 2012
=2011
;2011 2012
(2)3.25×
+7.75×3 5
-3 5
,3 5
=
×(3.25+7.75-1),3 5
=
×10,3 5
=6;
(3)25%×1.25×32,
=25%×1.25×4×8,
=(0.25×4)×(1.25×8),
=1×10,
=10;
(4)389.5×35+38.95×650,
=38.95×350+38.95×650,
=38.95×(350+650),
=38.95×1000,
=38950.