
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 $a=-\frac{2017×2017-2017}{2016×2016+2016}$, $b=-\frac{2018×2018-2018}{2017×2017+2017}$, $c=-\frac{2019×2019-2019}{2018×2018+2018}$, find the value of abc.

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