问题 解答题
用简便方法计算
208×33+208×67125×13×8(4000+4)×25
638+195+805978×99+978125×32×25.
答案

(1)208×33+208×67,

=208×(33+67),

=208×100,

=20800;

(2)125×13×8,

=13×(125×8),

=13×1000,

=13000;

(3)(4000+4)×25,

=4000×25+4×25,

=100000+100,

=100100;

(4)638+195+805,

=638+(195+805),

=638+1000,

=1638;

(5)978×99+978,

=978×(99+1),

=978×100,

=97800;

(6)125×32×25,

=(125×8)×(4×25),

=1000×100,

=100000.

单项选择题 A1/A2型题
单项选择题 A型题