2x^2-根号2x-1/2=0
问题描述:
2x^2-根号2x-1/2=0
答
2x^2-√2x-1/2=0
4x^2-2√2x-1=0
(2x-√2/2)^2=1+1/2
(2x-√2/2)^2=3/2
2x-√2/2=±√6/2
x=(√2±√6)/4.