Any expression (except $0$ and $\infty$) to the power of $0$ is equal to $1$
Simplify the fraction $\frac{4y^{-2}z^3}{4x}$ by $4$
Applying the property of exponents, $\displaystyle a^{-n}=\frac{1}{a^n}$, where $n$ is a number
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