Решите: - 5/12+(-2/15) -3 3/14+(-1 4/63)

-5/12 + (-2/15) - 3 3/14 + (-1 4/63) = -4 1043/1260; 

Первое действие.

-5/12 + (-2/15) = -5/12 - 2/15 = -25/60 - 8/60 = (- 25 - 8)/60 = -33/60 = -11/20;

Второе действие.

-11/20 - 3 3/14 = -11/20 - 45/14 = -77/140 - 450/140 = (-77 - 450)/140 = -527/140 =

= -3 107/140;

Третье действие.

-3 107/140 - 1 4/63 = -527/140 - 67/63 = -4743/1260 - 1340/1260 = (-4743 - 1340)/1260 =

= -6083/1260 = -4 1043/1260;