2-160%x=4/5解：将算式换算成小数2-1.6x=0.81.6x=2-0.81.6x=1.2x=1.2÷1.6x=0.75或3/4
2-1.6x=0.8，1.6x=1.2，x=1.2÷1.6=0.75
