n: \(\left(\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}\right)-\left(\dfrac{79}{67}-\dfrac{28}{41}\right)\)
\(=\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}-\dfrac{79}{67}+\dfrac{28}{41}\)
\(=\dfrac{1}{3}+\left(\dfrac{12}{67}-\dfrac{79}{67}\right)+\left(\dfrac{13}{41}+\dfrac{28}{41}\right)\)
\(=\dfrac{1}{3}-1+1=\dfrac{1}{3}\)
p: \(\dfrac{6^2+3\cdot6^2+3^2}{-13}\)
\(=\dfrac{3^2\cdot2^2+3^3\cdot2^2+3^2}{-13}\)
\(=\dfrac{3^2\left(2^2+3\cdot2^2+1\right)}{-13}=\dfrac{3^2\cdot\left(4+12+1\right)}{-13}\)
\(=\dfrac{-153}{13}\)
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