问题标题:
【先化简,再求值{x-x/(x+1)}除以{1+1/(x^2-1)},其中x=(根号2)+1】
问题描述:
先化简,再求值{x-x/(x+1)}除以{1+1/(x^2-1)},其中x=(根号2)+1
乔海燕回答:
{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
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