2(x-1)² = 8(x-1)² = 4x-1 = 2 或 x - 1 = -2x = 3 或 x = -1
2(x-1)^2=8(x-1)^2=4 X-1=2或X-1=-2 X1=3，X2=-1
2x-2=4x=3
2(x-1)^2=8(x-1)^2=4x^2-2x+1 = 4x^2-2x-3 = 0(x+1)(x-3) = 0x = -1 or x=3
