C3=(-1)*3 3/2=-16,5

It looks like you might be trying to perform some calculations, but the notation isn't clear. Could you please clarify what you want to achieve?

If you meant to evaluate the expression \( C3 = (-1) \times 3 \times \frac{3}{2} \), we can simplify it step-by-step:

1. Multiply \((-1)\) and \(3\): \[ (-1) \times 3 = -3 \]

2. Now, multiply \(-3\) by \(\frac{3}{2}\): \[ -3 \times \frac{3}{2} = -\frac{9}{2} \]

3. Convert \(-\frac{9}{2}\) to a decimal: \[ -\frac{9}{2} = -4.5 \]

So, \( C3 = -4.5 \).

If this isn't what you intended, please provide more details!