![](https://iknow-base.cdn.bcebos.com/lxb/notice.png)
第21题求解,在线等!! 20
1个回答
展开全部
由韦达定理得:
x1+x2=5/2,x1x2=½
x1³+x2³
=(x1+x2)(x1²-x1x2+x2²)
=(x1+x2)[(x1+x2)²-3x1x2]
=(5/2)[(5/2)²-3·½]
=95/8
x1+x2=5/2,x1x2=½
x1³+x2³
=(x1+x2)(x1²-x1x2+x2²)
=(x1+x2)[(x1+x2)²-3x1x2]
=(5/2)[(5/2)²-3·½]
=95/8
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