0.89×100.1,=0.89×100+0.89×0.1,=89+0.089,=89.089; 146.5-(23+46.5),=146.5-46.5-23,=100-23,=77;5.83×2+4.27,=11.66+4.27,=15.93; (45.9-32.7)÷8÷0.125,=13.2÷(8×0.125),=13.2÷1,=13.2.