(2008+200.8+20.08+2.008+1992+199.2+19.92+1.992)怎么写?

问题描述:

(2008+200.8+20.08+2.008+1992+199.2+19.92+1.992)怎么写?

原式=2008+(200.8+199.2)+(20.08+19.92)+(2.008+1.992) (利用结合律)
=2008+400+40+4
=2452