问题
解答题
用简便方法计算
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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.