①1375+450÷18×25,=1375+25×25,=1375+625,=2000;②4.05-2.86-0.14,=4.05-(2.86+0.14),=4.05-3,=1.05;③75×60%+24× 3 5 +0.6,=75×0.6+24×0.6+0.6,=0.6×(75+24+1),=0.6×100,=60;④31.9×18-8×31.9,=31.9×(18-8),=31.9×10,=319.