(x²-y)²-(2y-2)²
^4表示4次方
9x^4-36y²
(a²-2b)²-(1-2b)²
參考答案:(x�y)�(2y-2)�
=(x^2-y+2y-2)(x^2-y-2y+2)
=(x^2+y-2)(x^2-3y+2)
9x^4-36y�
=[3x^2-6y)(3x^2+6y)
=9(x^2-2y)(x^2+2y)
(a�2b)�(1-2b)�
=(a^2-2b+1-2b)(a^2-2b-1+2b)
=(a^2-4b+1)(a^2-1)
=(a^2-4b+1)(a+1)(a-1)
