Madison Stump is a 13-year-old entrepreneur (企业家) in the USA. To save our planet, she has  1a green business, PaperAgain.
Madison lives in a “green” family. She is  2 trying to be 100% earth friendly. One day, Mandison was thinking over what else she could do to help the environment.  3, she thought, “Why not  4those used boxes and paper to create beautiful notebooks? And I can sell them to help people in need.” That night, Mandison made her first notebook with scrap paper (废纸), and she used an empty gum box for a 5 . It was the 6  of her green business.
     Mandison's first customer was her sister. She, of course, never   7  it! However, Mandison didn't mind because she got to see her use it. Before you know it, all Mandison's school friends were asking to buy the amazing notebooks. Then, Mandison's dad came up with the  8 idea of starting a website, PaperAgain.com, so that these notebooks could be bought online.
     Now Mandison is the  9  of a real business! Her notebooks are selling at the store in her hometown. And she is often  10  on the local television news!

“跳槽”“人才招聘会”“自主创业”等词的出现反映了改革开放以来我国  (    )

计算：

（1）（x^﹣2y）^﹣3

（2）$\frac{x}{x-1}$-$\frac{1}{x+1}$．​