题目内容

脱式计算(注意能简算的一定要简算哟)
2011
2012
×2013
3.25×
3
5
+7.75×
3
5
-
3
5
25%×1.25×32389.5×35+38.95×650.
(1)
2011
2012
×2013,
=
2011
2012
×(2012+1),
=
2011
2012
×2012+
2011
2012
×1,
=2011+
2011
2012

=2011
2011
2012


(2)3.25×
3
5
+7.75×
3
5
-
3
5

=
3
5
×(3.25+7.75-1),
=
3
5
×10,
=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.
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