Ответ:а) 0 1/3 − 8 = 1/3 − 24/3 = −23/3 = −7 2/3.б) −2 2/7 + 4 3/5 = −16/7 + 23/5 = (−80 + 161)/35 = 81/35 = 2 11/35.г) 3/8 : (−9/10) = 3/8 · (−10/9) = −5/12.д) 5/12 · (−6) = −5/2 = −2 1/2.ж) 1/7 · (−49) = −7.з) −10 : (−1/9) = −10 · (−9) = 90.