问题 解答题
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.
答案

(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.

单项选择题
单项选择题