
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
First, read the problem solved by Xiao Liang (1), then solve problem (2) following his method.  
Problem (1): Calculate $3.1468 \times 7.1468 - 0.1468^2$  
Xiao Liang's solution is as follows:  
Solution: Let $0.1468 = a$, then $3.1468 = a + 3$, $7.1468 = a + 7$  
The original expression becomes $(a + 3)(a + 7) - a^2$  
$= a^2 + 10a + 21 - a^2$  
$= 10a + 21$  
Substitute $a = 0.1468$ back in  
The original expression becomes $10 \times 0.1468 + 21 = 22.468$  
Therefore, $3.1468 \times 7.1468 - 0.1468^2 = \boxed{22.468}$  
Problem (2): Calculate: $67897 \times 67898 - 67896 \times 67899$.

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