计算:1998+199.8+19.98+1.998.
问题描述:
计算:1998+199.8+19.98+1.998.
答
1998+199.8+19.98+1.998
=(2000-2)+(200-0.2)+(20-0.02)+(2-0.002),
=2222-2.222,
=2222-(10-7.778),
=2222-10+7.778,
=2219.778.
答:算式的结果为2219.778.