[m] S=\int^{3}_{0}0,5x^2dx=0,5\cdot \int^{3}_{0}x^2dx= 0,5\cdot ( \frac{x^3}{3})|^{3}_{0}= 0,5\cdot ( \frac{3^3}{3}-\frac{0^3}{3})=[/m]
[m]=4,5[/m]
4 б)
[m] S=\int^{2}_{1}(0,5x^2-0.5)dx=0,5\cdot \int^{2}_{1}x^2dx-0,5\int^{2}_{1}dxx= 0,5\cdot ( \frac{x^3}{3})|^{2}_{1}-(0,5x)|^{2}_{1}=[/m]
[m]= 0,5\cdot ( \frac{2^3}{3}-\frac{1^3}{3})-0,5\cdot (2-1)=\frac {7-3}{6}=\frac{2}{3}[/m]