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$f(\sqrt{x}+1)=x+2\sqrt{x}$ 求 $f(x)$ 的解析式 换元法： 设 $t=\sqrt{x}+1$ ，则 $x=(t-1)^2$ ，且 ( $x\geq1$ ) $f(t)=(t-1)^2+2(t-1)=t^2-1$ $(t \geq 1)$ $f(x)=x^2-1$ $( x\geq 1 )$ 来源Markdown 公式指导手册 Special Symbols

前言It’s You的歌词算是首发吧，早在11还是10年我就问作者Sodeep Lama拿到了歌词。也发过在自己的QQ空间，不过后来QQ空间限制访问了。也没什么人能看到，也达不到共享的目的。直到今日，迷上了网易云音乐，想为它做点什么。恰好发现这首歌还没有歌词，就整理了一份歌词上传了上去。昨天刚刚通过审核。 歌词123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354[ti:It'S You][ar:Pari B][lr:Pari B][by:YinYongYou][00:03.24]Girl I'm just thinkin' about you[00:06.30]fantasizin', memorizin' moments you spended with me (yeah)[00:12.10]Girl I know thing can change[00:15.10]about me lately got me thinking[00:18.10]Nomatter what we're meant to be[00:19.30]You like my superstar( Your name on my guitar )[00:24.10]You're my celebrity( Your picture on my wall )[00:29.40]Just the way you are ( I love it how you are )[00:33.20]You and me ,meant to be, you should see[00:38.01]Gi ...