(x+y)^2-4(x+y-1)(x^2-4x)^2+8(x^2-4x)+16

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(x+y)^2-4(x+y-1)(x^2-4x)^2+8(x^2-4x)+16(x+y)^2-4(x+y-1)(x^2-4x)^2+8(x^2-4x)+16(x+y)^2-4(x+y-1)(x^2-4

(x+y)^2-4(x+y-1)(x^2-4x)^2+8(x^2-4x)+16
(x+y)^2-4(x+y-1)
(x^2-4x)^2+8(x^2-4x)+16

(x+y)^2-4(x+y-1)(x^2-4x)^2+8(x^2-4x)+16
(x+y)^2-4(x+y-1)=(x+y)^2-4(x+y)+4=(x+y-2)^2
(x^2-4x)^2+8(x^2-4x)+16=(x^2-4x+4)^2

=(x+y)^2-4(x+y)+4=[(x+y)-2}^2=(x+y-2)^2
=(x^2-4x+4)^2=(x-2)^4

1:
原式=(x+y)^2-4(x+y)+4=(x+y-2)^2 把X+Y看成一个数算
2:把x^2-4x看成一个数设为t
原式=t^2+8t+16=(t+4)^2
在把t带回去=(x^2-4x+4)^2=[(x-2)^2]^2=(x-2)^4