Calculate the values of the expressions at the accuracy of two decimal places. (Source: Entrance examination for technical training, spring 1990)

a) [[$ \displaystyle\frac {3.46 - 0.95 \cdot 2.13} {2.40 + 0.75} ≈ $]]

b) [[$ \displaystyle\frac {\pi} {3} \left(\sqrt{23.55} - 3.56 \right)^2 ≈ $]]