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【简答题】
已知函数f(x)=x 2 -8lnx,g(x)=-x 2 +14x. (Ⅰ)若函数y=f(x)和函数y=g(x)在区间(a,a+1)上均为增函数,求实数a的取值范围; (Ⅱ)若方程f(x)=g(x)+m有唯一解,求实数m的值.
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