3.997十19.96十l.9998十199.7 怎么简便

问题描述:

3.997十19.96十l.9998十199.7 怎么简便

3.997+19.96+1.9998+199.7
=4-0.003+20-0.04+2-0.0002+200-0.3
=226-0.3432
=225.6568