1) (y-27)/(2(3-y))+4y/(3-y)= (y-27+8y)/(2(3-y))=(9y-27)/(2(3-y))=(9(y-3))/(2(3-y))=
(9(y-3))/(-2(y-3))=9/-2=-4.5
2) (c-2)/(2(3c+2))-(c-6)/(5(3c+2))=(5(c-2)-2(c-6))/10(3c+2)=(5c-10-2c+12)/(10(3c+2))=(3c+2)/(10(3c+2)=1/10 ,общий знаменатель будет 10(3c+2)