1又4分之1*67.875+125*6.7875+1250*0.053375
=1.25*67.875+125*6.7875+1250*0.053375
=1.25*67.875+1.25*678.75+1.25*53.375
=1.25*（67.875+53.375+678.75）
=1.25*800
=1000我的4分之1去那里了1又4分之1等于1.25呀