8.9×4.3＝8.9×(4+0.3)＝8.9×4+8.9×0.3＝35.6+2.77＝38.379.6÷0.6＝16×0.6÷0.6＝16
8.9*4.3=4.3*(10-1-0.1)=43-4.3-0.439.6/0.6=96/6
把8.9变成9-0.1
