先凑整再计算原式=3.6×(200+1)-(2.5×46+25×5.4)=3.6×200+3.6-25×(4.6+5.4)=720-250+3.6=470+3.6=473.6
3.6×201-2.5×46-25×5.4=3.6×200+3.6-2.5×(46+54)=723.6-250=473.6