问题
解答题
2x4-20x2y2+18y4.
答案
2x4-20x2y2+18y4,
=2(x4-10x2y2+9y4),
=2(x2-y2)(x2-9y2),
=2(x+y)(x-y)(x+3y)(x-3y).
2x4-20x2y2+18y4.
2x4-20x2y2+18y4,
=2(x4-10x2y2+9y4),
=2(x2-y2)(x2-9y2),
=2(x+y)(x-y)(x+3y)(x-3y).