x+2+25/(x+2)=10 x=?快解方程

问题描述:

x+2+25/(x+2)=10 x=?

解方程

x+2+25/(x+2)=10
x(x+2)+2(x+2)+25=10(x+2)
x^2+2x+2x+4+25-10x-20=0
x^2-6x+9=0
(x-3)^2=0
x=3

x+2+25/(x+2)=10
x(x+2)+2(x+2)+25=10(x+2)
x^2-6x+9=0
(x-3)^2=0
x-3=0
x=3