解150/x-150/(x+3)=5
问题描述:
解150/x-150/(x+3)=5
答
150/x-150/(x+3)=5
150(x+3)-150x=5x(x+3)
150x+3*150-150x=5x^2+15x
450=5x^2+15x
x^2+3x=90
(x+3)^2=90+9
x+3=±3根号11
x=±3根号11-3