1.(x-1)(x^2-2x)+(x-1)
=(x-1)(x²-2x+1)
=(x-1)(x-1)²
2.x^3-9x
=x(x²-9)
=X(x+3)(x-3)
3.(a^2+1)^2-4a(a^2+1)+4a^2
=(a²+1-2a)²
=(a-1)的四次方
1.(x-1)(x^2-2x)+(x-1)
=(x-1)(x²-2x+1)
=(x-1)(x-1)²
2.x^3-9x
=x(x²-9)
=X(x+3)(x-3)
3.(a^2+1)^2-4a(a^2+1)+4a^2
=(a²+1-2a)²
=(a-1)的四次方