25又1/8*63+251.25*7/250+420.09用简便方法做

问题描述:

25又1/8*63+251.25*7/250+420.09用简便方法做

25又1/8*63+251.25*7/250+420.09
=(25+0.125)*7*9+10*(25+0.125)*7/250+420.09
=[(25+0.125)*7]*(9+10/250)+420.09
=25.125*7*(9+0.04))+420.09
=2010