д) (0,3 + 0,5) \(\cdot 1\frac{1}{2}\);

д) (0,3 + 0,5) \(\cdot 1\frac{1}{2}\) = 0,8 \(\cdot \frac{3}{2}\) = \(\frac{8}{10} \cdot \frac{3}{2}\) = \(\frac{4}{5} \cdot \frac{3}{2}\) = \(\frac{4 \cdot 3}{5 \cdot 2}\) = \(\frac{2 \cdot 3}{5 \cdot 1}\) = \(\frac{6}{5}\) = 1\(\frac{1}{5}\)

Ответ: 1\(\frac{1}{5}\)