若x,y为实数,且y= 1-4x + 4x-1 + 1 2 .求 x y +2+ y x - x y -2+ y x 的值.
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【简答题】After a layoff, the employees who keep their jobs usually have to ___________. A) find another job in case they are fired B) do what their bosses tell them to C) work longer hours to avoid being fired...