вычислите значение выражения: -2 9/20+5 7/30; -5 1/4+1 3/8; 4 3/7+(-8 9/14); 7 5/12+(-3 7/24); -6 11/12+(-8 13/18)

-2 9/20+5 7/30=-2 27/60+5 14/60=-27/60+3 14/60=-13/60+3=2 47/60
-5 1/4+1 3/8=-5 2/8+1 3/8=-4 2/8+3/8=-4 +1/8=-3 7/8
4 3/7+(-8 9/14)=4 3/7-8 9/14=4 6/14-8 9/14=6/14-4 9/14=-4 3/14
7 5/12+(-3 7/24)=7 5/12-3 7/24=7 10/24-3 7/24=4 3/24=4 1/8
-6 11/12+(-8 13/18)=-6 11/12-8 13/18=
-6 33/36-8 26/36=-14 59/36=-15 23/36