Question

Помогите!!! Заранее спасибо!

Answer 1

3 целых 1/4:(3/4-7/5)-2*1 целая 3/7=
13/4:(-13/20)-2*10/7=
-13/4*20/13-20/7=
-5-20/7=
-55/7=-7 целых 6/7≈7,85

Answer 2

$\frac{13}{4} \div ( \frac{15 - 28}{20} ) - \frac{2 \times 10}{7} = \frac{13}{4} \times \frac{20}{ - 13} - \frac{20}{7} = \frac{ - 5}{1} - \frac{20}{7} = \frac{ - 35 - 20}{7} = - \frac{55}{7} = - 7 \frac{6}{7}$≈7,85