第1个回答 2011-11-25
x^4-1
=(x^2+1)(x^2-1)
=(x^2+1)(x+1)(x-1)
第2个回答 2011-11-25
x^4+1
=(x²)²+2x²+1-2x²
=(x²+1)²-(√x)²
=(x²+√2x+1)(x²-√2x+1)本回答被提问者采纳
第3个回答 2011-11-25
(x+1)(x-2)(x+3)(x-4)+25 =(x+1)(x-2)(x+3)(x-4)+25 =(x^2-x-2)(x^2-x-12)+25 =(x^2-x-2)[(x^2-x-2)-10]+25