Question

2x×(y-x)+(x+y)×(x-y)

因式分解：（1）x（x+y）（x-y）-y〔（y-x）(y-x)〕
(2)a * a * a + 3a * 3a * 3a - 9a - 27
(3)a * a + 2bc - b * b - c * c
(4)9x * 9x * 9x * 9x + 2x * 2x * y * y + y * y * y * y
(2)a×a ×a + 3a×3a×3a - 9a - 27
(3)a×a + 2bc - b×b - c×c
(4)9x×9x×9x×9x + 2x×2x×y×y+y×y×y×y
回答问题补充就可以了

Answer 1

x（x+y）（x-y）-y（y-x）(y-x)
=x(x+y)(x-y)+y(x-y)(y-x)
=(x-y)(x2+xy+y2-xy)
=(x-y)(x2+y2)
剩下的都看不懂了.
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