Question

4(x-y)3-8x(x-y)2 x^4-1 a^2-b^2-4a+4b 因式分解

Answer 1

4(x-y)3-8x(x-y)2=4（x-y)^2(-3x-y)

x^4-1 =(x^2+1)(x+1)(x-1)

a^2-b^2-4a+4b =a^2-4a+4-(b^2-4b+4)=(a-2)^2-(b-2)^2