问题 解答题

用简便方法计算:

(1)(0.2)2008×(-25)1005

(2)19962-16.

答案

(1)(0.2)2008×(-25)1005

=(0.2)2008×(-52010),

=(0.2)2008×(-52008)×52

=-(0.2×5)2008×25,

=-25;

(2)19962-16,

=19962-42

=(1996+4),

=2000×1992,

=3984000.

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