- #1

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## Homework Statement

Prove that

[tex]\frac ab = \frac{ac}{bc}[/tex]

## Homework Equations

Basic properties of numbers

## The Attempt at a Solution

I really don't understand what is left to show here? By definition c/c means c*c

^{-1}= 1. So is that is? That is:

[tex]

\begin{array}{l}

\frac ab &= \frac ab \cdot c\cdot c^{-1} \\

&= \frac ab \frac cc \\

&= \frac {ac}{bc}

\end{array}

[/tex]

I dunno. Is that it?