Question

Первое задание.
Все буквы.
Даю 25 баллов.

Answer 1

$1 frac{1}{8} * 9 frac{1}{3} = frac{9*28}{8*3} = frac{3*7}{2} = frac{21}{2} =10 frac{1}{2} =10,5$

$frac{3}{4} * frac{8}{9} = frac{3*8}{4*9} = frac{1*2}{1*3} = frac{2}{3}$

$frac{3}{10} * 2frac{6}{7} *1 frac{5}{9} = frac{3*20*14}{10*7*9} = frac{2*2}{3} = frac{4}{3} = 1frac{1}{3}$

Answer 2

1 ( 1/8 ) * 9 ( 1/3 ) = ( 9/8 ) * ( 28/3 )  = 84/8 = 21/2 = 10 ( 1/2 ) 
----------------------
( 3/4 ) * ( 8/9 ) = 2/3 
---------------------
( 3/10 ) * 2 ( 6/7 ) * 1 ( 5/9 ) = ( 3/10 ) * ( 20/7 ) * ( 14/9) = 4/3 = 1 ( 1/3 )