1、2005×0.375—0.375×1949＋3.75×2.4=200.5*3.75-3.75*194.9+3.75*2.4=3.75*(200.5-194.9+2.4)=3.75*8=302、（123456789.1×123456789.1）—123456789×123456789.2=（123456789.1×123456789.1）—(123456789.1...