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.