数学JJ那个abcd等于多少的怎么算啊？还有几道不明白的，急问那

xinxian

(x^2-5x-1+5)(x^2-5x-1-5)

=(x^2-5x+4)(x^2-5x-6)

=(x^2-4x-x+4)(x^2-6x+x-6)

=(x-4)(x-1)(x-6)(x+1)

Now, (-4)(-1)(-6)1 =-24