Question

Помогите пожалуйста !!!

Answer 1

1)
$( frac{3}{7} + frac{1}{5} ) times frac{5}{11} = ( frac{15}{35} + frac{7}{35} ) times frac{5}{11} = frac{22}{35} times frac{5}{11} = frac{2}{7}$
2)
$( frac{3}{5} + frac{1}{9} ) times frac{5}{8} =( frac{27}{45} + frac{5}{45} ) times frac{5}{8} = frac{32}{45} times frac{5}{8} = frac{4}{9}$

Answer 2

(3/7+1/5)*5/11=(15/35+7/35)*5/11=22/35*5/11=2/14=1/7

(3/5+1/9)*5/8=27/45+3/45)*5/8=30/45*5/8=5/12

Answer 3

фак 2/7

Answer 4

и 32/45*5/8=4/9