(1) a-1+b²(1-a)
= (a-1)-b²(a-1)
= (1-b²)(a-1)
= (1+b)(1-b)(a-1)
(2) x5 -1
=x(x4-1)
=x(x2+1)(x2-1)
=x(x2+1)(x+1)(x-1)
祝你学习进步!呵呵
(1) a-1+b²(1-a)
= (a-1)-b²(a-1)
= (1-b²)(a-1)
= (1+b)(1-b)(a-1)
(2) x5 -1
=x(x4-1)
=x(x2+1)(x2-1)
=x(x2+1)(x+1)(x-1)
祝你学习进步!呵呵