.1.（a-b)(a²-ab+b²）+ab(b-a)2.(1-x²）²-（6x²-6）+9请写出过程....................................

Question

.
1.（a-b)(a²-ab+b²）+ab(b-a)
2.(1-x²）²-（6x²-6）+9
请写出过程....................................

Answer 1

1.
（a-b)(a²-ab+b²）+ab(b-a)
=(a-b)[(a^2-ab+b^2)-ab]
=(a-b)(a^2-2ab+b^2)
=(a-b)^3
2.
(1-x²）²-（6x²-6）+9
=(x^2-1)^2-6(x^2-1)+9
=[(x^2-1)-3]^2
=(x^2-4)^2
=(x+2)^2(x-2)^2