$$\frac{3}{4} = 0.75$$
$$\frac{5}{8} = 0.625$$
$$\frac{7}{4} = 1.75$$
$$\frac{83}{25} = \frac{83 \times 4}{25 \times 4} = \frac{332}{100} = 3.32$$
$$5\frac{1}{2} = 5.5$$
$$70\frac{3}{75} = 70\frac{1}{25} = 70\frac{4}{100} = 70.04$$
$$4\frac{21}{84} = 4\frac{1}{4} = 4.25$$
Ответ: 0.75; 0.625; 1.75; 3.32; 5.5; 70.04; 4.25.