3.333×3.333=几用巧算

问题描述:

3.333×3.333=几用巧算

3.333×3.333
=1.111×9.999
=1.111×(10-0.001)
=11.11-0.001111
=11.108889999×999+1999=?用巧算,不用x解答,拜托了