3999×3999/4000-999简算

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3999×3999/4000-999简算
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3999×3999/4000-999简算
3999×3999/4000-999简算

3999×3999/4000-999简算
=[(3999+1)×3999-3999]/4000-999
=(4000×3999-3999)/4000-999
=1×3999-3999/4000-999
=3999-3999/4000-999
=3999-(3999/4000+1/4000)-999+1/4000
=3999-1-999+1/4000
=2999+1/4000
=你要的答案