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急问
1.已知函数f(X)的导函数f'(x)=2x-9,且f(x)的值为整数,当x属于(n,n+1】时,f(x)的值为正数的个数有且只有一个,则n=?
2.(英语题)St Nicholas is presented as____Father Christmas.(选哪一个,为什么选哪一个) A.much thinner B.thinner than C.being much thinner than D.thin as [ 本帖最后由 jiangyifan 于 2009-7-31 19:36 编辑 ] |
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发布于:2011-02-24 15:43
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