来自宋晓伟的问题
【先化简,再求值{x-x/(x+1)}除以{1+1/(x^2-1)},其中x=(根号2)+1】
先化简,再求值{x-x/(x+1)}除以{1+1/(x^2-1)},其中x=(根号2)+1
1回答
2020-09-28 14:37
【先化简,再求值{x-x/(x+1)}除以{1+1/(x^2-1)},其中x=(根号2)+1】
先化简,再求值{x-x/(x+1)}除以{1+1/(x^2-1)},其中x=(根号2)+1
{x-x/(x+1)}/{1+1/(x^2-1)}
=x*[1-1/(x+1)]/[1+1/(x^2-1)]
=x*x(x-1)/x^2
=x-1=根号2