Пошаговое объяснение:

№15

1)

3 2/5 + (-4 1/3) - 2 7/15 = 3 2/5 - 4 1/3 - 2 7/15 =

3 6/15 - 4 5/15 - 2 7/15 = 3 6/15 - 3 20/15 - 2 7/15 =

-14/15 - 2 7/15 = -2 21/15 = -2 7/5 = -3 2/5

2)

2 5/24 - 4 5/8 - (-3 5/12) + (-1/6) =

2 5/24 - 4 5/8 + 3 5/12 - 1/6 =

2 5/24 - 4 15/24 + 3 10/24 - 4/24 =

-2 10/24 + 3 10/24 - 4/24 =

1 - 4/24 = 24/24 - 4/24 = 20/24 = 5/6

№95

1) 14,9 - 15,1 = -(15,1 - 14,9) = -0,2

2) 32,5 - (-7) = 32,5 + 7 = 39,5

3) -12,3 - 13,2 = -(12,3 + 13,2) = -25,5

4) -12,9 - (-8,9) = -12,9 + 8,9 = -(12,9 - 8,9) = -4

5) 7/8 - 1 = 7/8 - 8/8 = -(8/8 - 7/8) = -1/8

6) -2/9 - 3 = -(2/9 + 3) = -3 2/9

7) -4 1/3 - (-5 1/3) = -4 1/3 + 5 1/3 = 5 1/3 - 4 1/3 = 1

8) 2 5/9 - (-1 4/9) = 2 5/9 + 1 4/9 = 3 9/9 = 4