решите уравнения: а) (-7/10)+(-4/15) б) (-1 1/3)-(4/8) в) (-3 1/7)*(3/11) г) (-5 3/5):(7/10)

а) (-7/10) + (-4/15) = (-21/30) + (-8/30) = (-21 – 8)/30 = -29/30. б) (-1(1/3)) – (4/8) = (-4/3) – (4/8) = (-32/24) – (12/24) = (-32 – 12)/24 = -44/24 = -11/6 = -1(5/6). в) (-3(1/7)) * (3/11) = (-22/7) * (3/11) = -6/7. г) (-5(3/5)) / (7/10) = (-28/5) * (10/7) = -8.