x^2/(5-x)=0.04x
x^2-0.04x(5-x)=0
x^2+0.04x^2-0.2x=0
x=0等式成立
x≠0
1.04x=0.2
x=0.2/1.04=5/26
综上所述：x=0或x=5/26x的平方除以5减x等于0.04。x^2/(5-x)=0.04x^2-0.04(5-x)=0x^2+0.04x-0.2=0根据求根公式x=-0.02±√0.2004 =-0.02±0.02√501