5991+599.1+59.91+5.991怎么简便计算

问题描述:

5991+599.1+59.91+5.991怎么简便计算

5991+599.1+59.91+5.991
=6000+600+60+6-9-0.9-0.09-0.009
=6666-9.999
=6666-10+0.001
=6656.001