(2000*0.4)+x /(2000+x )=0.5
问题描述：
(2000*0.4)+x /(2000+x )=0.5
答
x=-1 997.501561524
怀疑列式有误.
(2000*0.4)+x /(2000+x )=0.5
x=-1 997.501561524
怀疑列式有误.