问题 解答题
用简便方法计算.
404×25=

25×125×4×8=
8×137×125=17×36+17×64=
答案

(1)404×25,

=(400+4)×25,

=400×25+4×25,

=10000+100,

=10100;      

(2)25×125×4×8,

=(25×4)×(125×8),

=100000;

(3)8×137×125,

=8×125×137,

=1000×137,

=137000;        

(4)17×36+17×64,

=(36+64)×17,

=1700.

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