1. (x-√3)^2=0 x=√32. x^2-3/2x+9/16=0 得(x-3/4)^2=0 x=3/43. [x+(√2+1)/2]^2=[（√2-1)/2]^2 得x=-1或x=-√24. x^2- 2√2x-4=0 (x-√2)^2=6=(√6)^2 得x=√2±√6
