
已知x=根号2+1,求(x+1/x²-x-x/x²-2x+1)÷1/x的值
1个回答
展开全部
解:x=√2+1
原式=[(x+1)/(x²-x)-x/(x²-2x+1)]÷(1/x)
={(x+1)/[x(x-1)]-x/(x-1)²}×x
={(x+1)(x-1)/[x(x-1)²]-x²/[x(x-1)²]}×x
={(x²-1-x²)/[x(x-1)²]}×x
=-1/(x-1)²
=-1/(√2+1-1)²
=-1/(√2²)
=-1/2
希望对你有所帮助 还望采纳~~~
原式=[(x+1)/(x²-x)-x/(x²-2x+1)]÷(1/x)
={(x+1)/[x(x-1)]-x/(x-1)²}×x
={(x+1)(x-1)/[x(x-1)²]-x²/[x(x-1)²]}×x
={(x²-1-x²)/[x(x-1)²]}×x
=-1/(x-1)²
=-1/(√2+1-1)²
=-1/(√2²)
=-1/2
希望对你有所帮助 还望采纳~~~
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