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If signs aren't a big deal, use the generalized mean formula
$$ \left(\frac{1}{n}\sum x_i^n\right)^{1/n} $$$$ \left(\frac{1}{n}\sum x_i^k\right)^{1/k} $$
for $n\to -\infty$$k\to -\infty$.
$$ \left(\frac{1}{n}\sum x_i^n\right)^{1/n} $$
for $n\to -\infty$.
$$ \left(\frac{1}{n}\sum x_i^k\right)^{1/k} $$
for $k\to -\infty$.
