57,5:(—0,5)

To solve the expression \( 57.5 \div (-0.5) \), you can follow these steps:

1. Divide \( 57.5 \) by \( -0.5 \).
2. When you divide a positive number by a negative number, the result will be negative.

Calculating the division:

\[ 57.5 \div 0.5 = 115 \]

So:

\[ 57.5 \div (-0.5) = -115 \]

Therefore, the answer is \( -115 \).