
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the function $f(x)=a\ln x+bx$ ($a,b\in\mathbb{R}$), the equation of the tangent line to the curve $y=f(x)$ at the point $(1,f(1))$ is $x-2y-2=0$.  
(Ⅰ) Find the expression for $f(x)$;  
(Ⅱ) When $x > 1$, $f(x)+ \frac {k}{x} < 0$ always holds, find the range of the real number $k$.

Present the answer in LaTex format: \boxed{Your answer}
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