1) (3\4+1\5)*5\19  2) (12 1\3 - 7 3\4)*6/11

(3/4 + 1/5) * 5/19 = 1/41) 3/4 + 1/5 = 15/20 + 4/20 = 19/202) 19/20 * 5/19 = 5/20 = 1/4 = 0,25 (12 1/3 - 7 3/4) * 6/11 = 2 1/21) 12 1/3 - 7 3/4 = 12 4/12 - 7 9/12 = 11 16/12 - 7 9/12 = 4 7/122) 4 7/12 * 6/11 = 55/12 * 6/11 = 5/2 = 2 1/2 = 2,5