(4002×3999)如何简便运算?
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(4002×3999)如何简便运算?
4002×3999
=4002×(4000-1)
=4002×4000-4002
=(4000+2)×4000-4002
=4000²+8000-4002
=16000000+3998
=16003998
(4002×3999)如何简便运算?
4002×3999
=4002×(4000-1)
=4002×4000-4002
=(4000+2)×4000-4002
=4000²+8000-4002
=16000000+3998
=16003998