(1) 9x^(n+1)-36x^n+36x^(n-1)
=9x^(n-1)(x²-4x+4)
=9x^(n-1)(x-2)²
(2) 应该是2(2x-1)^2-4/3(2x-1)+2/9
=2[(2x-1)²-2/3(2x-1)+1/9]
=2(2x-1-1/3)²
=2(2x-4/3)²
(1) 9x^(n+1)-36x^n+36x^(n-1)
=9x^(n-1)(x²-4x+4)
=9x^(n-1)(x-2)²
(2) 应该是2(2x-1)^2-4/3(2x-1)+2/9
=2[(2x-1)²-2/3(2x-1)+1/9]
=2(2x-1-1/3)²
=2(2x-4/3)²