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用简便方法计算.(1)(-14)4005×162003=______;(2)318×(-19

2022-08-15 13:43:37 问答库 阅读 206 次

问题详情

用简便方法计算.
(1)(-1

4

)4005×162003=______;
(2)318×(-1

9

)8=______;
(3)(0.5×32

3

)199?(-2×3

11

)200=______;
(4)0.259×220×259×643=______.

参考答案

(1)(-14)4005×162003
=(-14)4005×(422003
=(-14)4005×44006
=(-14)4005×44005×4
=[(-14)×4]4005×4
=(-1)×4
=-4;
(2)318×(-19)8
=318×[-(13)2]8
=318×(13)16
=316+2×(13)16
=(3×13)16×32
=9;
(3)(0.5×323)199?(-2×311)200
=(0.5×113)199?(-2×311)200
=[0.5×113×(-2)×311]199×(-2×311)
=611;
(4)0.259×220×259×643
=0.259×643×220×259
=0.259×(433×410×259
=(0.25×4)9×(4×25)9×4
=4×1018

考点:方法