Ответ:
Пошаговое объяснение:
1.
1) 3,5 - 3 1/3 = 35/10 - 10/3 = 105/30 - 100/30 = 5/30 = 1/6,
2) 1/6 * (-5 1/7) = -1/6 * 36/7 = -6/7,
3) 1 1/3 : (5,6) = -4/3 : 56/10 = -4/3 * 10/56 = -5/21,
4) -6/7 - 5/21 = -18/21 - 5/21 = -23/21 = - 1 2/21,
2.
15,87 * (-1,09) + (-5,87) * (-1,09) =
= -1,09 * (15,87 - 5,87) = -1,09 * 10 = -10,9,
3.
а) 0,(7) = 0,77777777777.....,
б) 2,4(3) = 2,433333333...