计算:1.996+19.97+199.8=_.

问题描述:

计算:1.996+19.97+199.8=______.

1.996+19.97+199.8,
=(2-0.004)+(20-0.03)+(200-0.2),
=222-(0.004+0.03+0.2),
=221.766;
故答案为:221.766.