(1-2\frac{1}{2})^3-(-2)^3=(-1\frac{1}{2})^3-(-8)=(-\frac{3}{2})^3+8=-\frac{27}{8}+8=8-3\frac{3}{8}=4\frac{5}{8}=4,625
(1\frac{1}{4})^2-(1\frac{1}{2})^4=(\frac{5}{4})^2-(\frac{3}{2})^4=\frac{25}{16}-\frac{81}{16}=-\frac{56}{16}=-\frac{7}{2}=-3\frac{1}{2}=-3,5
(1\frac{1}{5}+7^{15})^2-(5*\frac{1}{3})^2=(