Математика 9 класс Помогите

$(5 \frac{5}{10} - 2 \frac{5}{6} ):4-1= \\ (5 \frac{15}{30} -2 \frac{25}{30} ):4-1= \\ 2 \frac{20}{30} :4-1=2 \frac{2}{3} :4-1= \\ \frac{8}{3} :4-1= \frac{2}{3} -1=- \frac{1}{3}$

$\frac{0.3}{0.18} = \frac{30}{18} = \frac{5}{3} =1 \frac{2}{3}$

$\frac{13}{20} :0.2= \frac{13}{20} : \frac{2}{10} \\ = \frac{13*10}{20*2} = \frac{13}{4} =3 \frac{1}{4}$

$\frac{(1.2+0.8)(1.2-0.8)}{1.4-1} = \frac{(2*0.4)}{0.4} = \frac{0.8}{0.4} = \frac{8}{4} =2$