因式分解!!

X²-（y²-2y+1）

-3m^2n+n^b+2+6m^a+1n^2b+3

x²（X²-2）+1

-ax^n-1-9ax^n+1+6ax^n

X²-（y²-2y+1）=X²-（y-1)²=(x=y-1)(x-y+1)

第二个题目不清楚

x²（X²-2）+1=（x²）²-2x²+1=(x²-1)²==(x+1)²(x-1)²

-ax^n-1-9ax^n+1+6ax^n=-ax^n-1(9x²-6x+1)=-ax^n-1(3x-1)²

X²-（y²-2y+1）=X2-(y-1)2=(x+y-1)(x-y+1)

x²（X²-2）+1=x4-2x2+1=x4-x2-x2+1=x2(x2-1)-(x2-1)=(x2-1)2=(x+1)2(x-1)2