а) 3/4 + 1/11 = 33/44 + 4/44 = 37/44
б) 3/8 × 2/5 = 6/40 = 3/20
в) 2(-5/6 ÷ 8/9) = 2(-15/18 ÷ 16/18) = 2(-15/18 × 18/16) = 2(-15/16) = -30/16 = -15/8 = -1 7/8 = -1,875
а) 3/4 + 1/11 = 33/44 + 4/44 = 37/44
б) 3/8 × 2/5 = 6/40 = 3/20
в) 2(-5/6 ÷ 8/9) = 2(-15/18 ÷ 16/18) = 2(-15/18 × 18/16) = 2(-15/16) = -30/16 = -15/8 = -1 7/8 = -1,875