设函数\(f(x)=\ln x-x+1\).
\((1)\)讨论\(f(x)\)的单调性;
\((2)\)证明:当\(x∈(1,+∞)\)时,\(1 < \dfrac{x-1}{\ln x} < x\);
\((3)\)设\(c > 1\),证明:当\(x∈(0,1)\)时,\(1+(c-1)x > c^{x}\).
进入组卷