222.15-x/x *100%=-1.21%?假如是:[(222.15-x)/x ]*100%=-1.21%[(222.15-x)/x ]*100%=-1.21%[(222.15-x)/x ]=-1.21%两边同乘x:222.15-x=-1.21%x222.15=x-0.0121xx=222.15/(0.9879)=2221500/9879=740500/3293≈223.86...