已知x2=3-2倍根号2,则x=
问题描述:
已知x2=3-2倍根号2,则x=
答
答:
x^2=3-2√2
=2-2√2+1
=(√2)^2-2*√2*1+1^2
=(√2-1)^2
所以:
x=√2-1或者x=1-√2