题目

One of today's hottest topics among women （and to an extent among men too now） is anti aging and how to reverse the signs of age．The beauty industry has responded to this by offering a wide collection of anti aging creams and other anti aging products aimed at all pocketbooks，ranging from economical to highly priced． And the question is “do any of these often much-vaunted （被过度吹嘘的） anti aging creams actually work?” And if they do，how precisely do they perform their miracles? Well the appropriate response to that is that they do work - after a fashion．T当x=______时，分式x-2x+2的值为零．