2. Simplify \( 2 a-\{5 a-[8 a-(2 b+a)]\} \), and find the value \( (a-b)\left[a^{2}+b(a+b)\right...

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2. Simplify \( 2 a-\{5 a-[8 a-(2 b+a)]\} \), and find the value \( (a-b)\left[a^{2}+b(a+b)\right] \) when \( a=1, b=2 \).
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