求这三道题的怎么写！！（因式分解） 要有具体过程+答案！！！ 求快啊学霸们！！！

Question

如题所述

Answer 1

Answer 2

(4)
x^2.y-4y
=y(x^2-4)
=y(x+2)(x-2)

(5)
-6x^3+12x^2y-6xy^2
=-6x(x^2-2xy+y^2)
=-6x(x-y)^2

(6)
(y^2+1)^2-4y^2
=(y^2+1-2y)(y^2+1+2y)
=(y-1)^2.(y+1)^2

Answer 3

4.=y(x^2-4)
=y(x+2)(x-2)
5.=-6x(x^2-2xy+y^2)
=-6x(x-y)^2
6.=(y^2+1+2y)(y^2+1-2y)
=(y+1)^2(y-1)^2

Answer 4

4、原式=y（x+2）（x-2）
5、原式=-6x（x^2-2xy+y^2)=-6x(x-y)^2
6、原式=(y^2+1+2y)(y^2+1-2y)=(y+1)^2(y-1)^2

Answer 5

-6 x3+12x2y-6xy2
=-6x(x2-2xy+y2)
=-6x(x-y)2追答

4.=y(x^2-4)
=y(x+2)(x-2)
6.=(y^2+1+2y)(y^2+1-2y)
=(y+1)^2(y-1)^2

Answer 6

望采纳！