√[（x-1)-2*2*√(x-1)+4]+√[(x-1)-2*3√(x-1)+9]
=√[√(x-1)-2]^2+√[√(x-1)-3]^2
=±[√(x-1)-2]±[√(x-1)-3]
=2√(x-1)-5 或 -2√(x-1)+5 或 ±1
