120/169 * 13/16 + 200/243 : 100/81 - 1/13 * 10 =

120/169 * 13/16 + 200/243 : 100/81 - 1/13 * 10 =

Сокращаем 169 и 13 на 13; 120 и 16 на 8;

15/13• 1/2 + 200/243• 81/100 - 10/13=

Сокращаем 200 и 100 на 109; 243 и 81 на 81;

15/13• 1/2 + 2/3• 1/1 - 10/13=

15/26 + 2/3 - 10/13=

(15•3) / (26•3) = (2•26) / (3•26) - (10•6) / (13•6) =

30/78 + 52/78 - 60/78=

82/78 - 60/78=

22/78=

Сокращаем на 2

= 11/39