x+2+25/(x+2)=10 x=?快解方程
问题描述:
x+2+25/(x+2)=10 x=?
快
解方程
答
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
答
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