найдите значение выражения

    1)     (-1 2/5 + (-3,6)) + (-2 5/6 + (-2/3)) = -8,5

1.      -1 2/5 = -7/5;

2.     -3,6 = -3 6/10 = - 36/10 = - 18*2/5*2 = -18/5;

3.     -1 2/5 + (-3,6) = -7/5 + (-18/5) = -7/5 - 18/5 = (-7-18)/5 = -25/5 = -5

4.     -2 5/6 = -17/6;

5.     -2/3 = -2*2/3*2 = -4/6;

6.    - 2 5/6 + (-2/3) = -17/6 + (- 4/6) = -17/6 -4/6 = (-17-4)6 = -21/6;

7.      -5 + (-21/6) = -5/1 - 21/6;

8.     -5/1 = -5*6/1*6 = -30/6;

9.     -30/6 - 21/6 = -51/6 = -17*3/2*3 = -17/2 = -8,5

Ответ:   -8,5.

    2)   (-5/8 + (-3/4)) + (-7,6 + (-2 2/5))

1.   -3/4 = -3*2/4*2 = -6/8;

2.   -5/8 + (-3/4) = -5/8 + (-6/8) = -5/8 - 6/8 = (-5-6)/8 = -11/8;

3.   -7,6 = -7 6/10 = -76/10 = -38*2/5*2 = -38/5;

4.   -2 2/5 = -12/5;

5.   -7,6 + (-2 2/5) = -38/5 + (-12/5) = -38/5 - 12/5 = (-38-12)/5 = -50/5 = = -10;

6.   -11/8 + (-10) = -11/8 - 10 = -11/8 - 10/1;

7.   -10/1 = -10*8/1*8 = -80/8;

8.   -11/8 - 80/8 = (-11-80)/8 = -91/8 = -11 3/8 = -11 целых 3/8

Ответ: -11 3/8.