-14/15*25/28=-5/6

-36/37:(-6/37)=-36/37*(-37/6)=6

6+(-5/6)=6-5/6=5 1/6

1) - 14\15 * 25\28 = - 5\6

2) ( - 36\37) : ( - 6\37) = 36\37 * 37\6 = 6

3) - 5\6 + 6 = -5+36 \ 6 = 31\6 = 5  1\6