1998+199.8+19.98+1.998用简便方法计算

2024-11-20 10:39:13
推荐回答(1个)
回答(1):

=1998+(200-0.2)+(20-0.02)+(2-0.002)
=(1998+2+200+20)-0.2-0.02-0.002
=2220-0.222
2219.778