【分解因式】x²-2x+1 4x²-4xy+y² m²-4m+4 4x²-8x+4【分解因式】x²-2x+14x²-4xy+y²m²-4m+44x²-8x+4a²-8a+16a²+6a+94-4m+m²

x²-2x+1=(x-1)x(x-1)
4x²-4xy+y²=(2x-y)x(2x-y)
m²-4m+4=(m-2)x(m-2)
4x²-8x+4=4x(x-1)x(x-1)
a²-8a+16=(a-4)x(a-4)
a²+6a+9=（a+3）x（a+3）
4-4m+m²=(2-m)x(2-m)

（X-1）^2
(2x-y)^2
(m-2)^2
4(x-2)^2
(a-4)^2
(a 3)^2
(2-m)^2