14.28-(10-2.72)
=14.28-10+2.72
=14.28+2.72-10
=17-10
=71.12/3.5/0.02的简便方法1.12/3.5/0.02=1.12/(3.5*0.02)=(1.12*100)/(3.5*0.02*100)=112/7=16(1.25-0.5)*1.6的简便方法(1.25-0.5)*1.6=1.25*1.6-0.5*1.6=1.25*4*0.4-0.5*2*0.8=5*0.4-0.8=2-0.8=1.2