3a-15/3 ; 16a-2b/8a-b ; 10-6a/3a-5 ; 12a-4/1-3a ; c-5/4c-20 ; 4a-b/2b-8a. решите : 3

(16a-2b)/(8a-b)=2(8a-b)/(8a-b)=2
(10-6a)/(3a-5)=2(5-3a)/(3a-5)=-2(3a-5)/(3a-5)=-2
(12a-4)/(1-3a)=4(3a-1)/(1-3a)=-4(1-3a)/(1-3a)=-4
(c-5)/(4c-20)=(c-5)/4(c-5)=1/4=0.25
(4a-b)/(2b-8a)=(4a-b)/2(b-4a)=-(b-4a)/2(b-4a)=-1/2=-0.5