14,15题求过程
展开全部
14.
x⁴-x²-20
=(x²-5)(x²+4)
=(x+√5)(x-√5)(x²+4)
15.
x³+x²y+xy+y-1
=(x³-1)+(x²y+xy+y)
=(x+1)(x²+x+1)-y(x²+x+1)
=(x²+x+1)(x-y+1)
x⁴-x²-20
=(x²-5)(x²+4)
=(x+√5)(x-√5)(x²+4)
15.
x³+x²y+xy+y-1
=(x³-1)+(x²y+xy+y)
=(x+1)(x²+x+1)-y(x²+x+1)
=(x²+x+1)(x-y+1)
追问
哥立方差公式错了。。
追答
x³+x²y+xy+y-1
=(x³-1)+(x²y+xy+y)
=(x-1)(x²+x+1)+y(x²+x+1)
=(x²+x+1)(x+y-1)
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
14.原式=(X²-5)(X²+4)
=(X+√5)(X-√5)(X²+4)
15.原式=x³+x²y+xy+y-1
=(x³-1)+(x²y+xy+y)
=(x-1)(x²+x+1)-y(x²+x+1)
=(x²+x+1)(x-y-1)
请采纳
=(X+√5)(X-√5)(X²+4)
15.原式=x³+x²y+xy+y-1
=(x³-1)+(x²y+xy+y)
=(x-1)(x²+x+1)-y(x²+x+1)
=(x²+x+1)(x-y-1)
请采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询