Найдите сумму : (-1/2) + (-5); (-7) + (-2/3); (-1/3) + (-1/2); (-1 2/5) + (-1/3)

1) (-1/2) + (-5) = -1/2 - 5 = -1/2 - 2 * 5/2 = -1/2 - 10/2 = -(1 + 10)/2 = -11/2;

Ответ: -11/2.

2) (-7) + (-2/3) = -7 - 2/3 = -7 * 3/3 - 2/3 = -21/3 - 2/3 = -(21 + 2)/3 = -23/3;

Ответ: -23/3.

3) (-1/3) + (-1/2) = -1/3 - 1/2 = -2/6 - 3/6 = -(2 + 3)/6 = -5/6;

Ответ: -5/6.

4) (-1 2/5) + (-1/3) = -1 2/5 - 1/3 = -7/5 - 1/3 = -21/15 - 5/15 = -26/15;

Ответ: -26/15.