(2 5\6 + 1 7\9) • 3 3\5 + (2 5\6 - 1 7\9) •(-2 16\19)

(2 5\\6 + 1 7\\9) • 3 3\\5 + (2 5\\6 - 1 7\\9) •(-2 16\\19) = ( 2 целых 5 / 6 + 1 целая 7 / 9) – 3 целых 3 / 5 + ( 2 целых 5 / 6 - 1 целая 7 / 9 ) * ( - 2 целых 16 / 19 ) = ( ( 2 * 6 + 5 ) / 6 + ( 1 * 9 + 7 ) / 9 ) – ( 3 * 5 + 3 ) / 5 + ( ( 2 * 6 + 5 ) / 6 – ( 1 * 9 + 7 ) / 9 ) * ( - ( 2 * 19 + 16 ) / 19 ) = ( 17 / 6 + 16 / 9 ) – ( 18 / 5 ) + ( 17 / 6 – 16 / 9 ) * ( - 54 / 19 ) = ( 17 * 3 + 16 * 2 ) / 18 - 18 / 5 + (17 * 3 - 16 * 2 ) / 18 * ( - 54 / 19 ) = 83 / 18 - 18 / 5 + 19 / 18 * ( - 54 / 19 ) = 83 / 18 - 18 / 5 - 54 / 18 = 29 / 18 - 18 / 5 = ( 29 * 5 - 18 * 18 ) / 90 = - 179 / 90 ответ: - 179 / 90