Выполните сложение:-3/5+(-1/5);-2/3+(-3/5);-4/5+(-5/6);-3 1/7+(-13/14);-1 2/5+(-2,8);-1 1/3+(-2,25).

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

-2/3+(-3/5) = -10/15+(-9/15) = 19/15 = 1 4/15;  

-4/5+(-5/6) = -24/30 + (-25/30) = -49/30 = -1 19/30;

-3 1/7+(-13/14) = -22/7 + (-13/14) = -44/14 + (-13/14) = -58/14 =   -4 2/14 =-4 1/7; 

-1 2/5+(-2,8) = -1 2/5 + (-2,8) = -1,4 +(-2,8) = -4,2.

-1 1/3+(-2,25) = -1 1/3 + (-2 1/4) = -4/3 + (-9/4) = -16/12 + (-27/12) = -43/12) = -3 7/12.