57426:56774-456

To solve the expression \( 57426:56774 - 456 \), we first need to clarify the meaning of the colon (":"). In some contexts, it may be used as a division symbol, while in others, it may represent a ratio. Here, I'll assume it represents division.

So, we can rewrite the expression as:

\[ \frac{57426}{56774} - 456 \]

Let's calculate \( \frac{57426}{56774} \):

1. Performing the division:

   \[ \frac{57426}{56774} \approx 1.0116 \]

2. Now, subtracting 456 from that result:

   \[ 1.0116 - 456 \approx -454.9884 \]

So, the final answer is approximately:

\[ -454.99 \] (rounded to two decimal places).

If the colon had a different meaning, please clarify!