1.
x^2-4x+4=（3-2x）^2 (平方用^)
(x-2)^2-(2x-3)^2=0
[(x-2)+(2x-3)][(x-2)-(2x-3)]=0
(3x-5)(-x+1)=0
x=5/3或x=1.
2.
x^2+（√3-√5）x-√15=0
(x-√5)(x+√3)=0
x=-√3或x=√5.