51a²b/48c * 15c²/34a³b²=17a²b/16c * 15c²/34a³b²=15c/32ab
(3c-4d)/(c+2d) * (4d²-c²)/(8d-6c)=(3c-4d)/(c+2d) * ((2d+c)(2d-c))/2(4d-3c)=((3c-4d)(2d-c))/2(4d-3c)
(2у-3х)/х : (9х²-4у²)=(2у-3х)/х * 1/((3х-2у)(3х+2у))= - (3х-2у)/х * 1/((3х+2у)(3х-2у))= - 1/х(3х+2у)
(р-4)/(р²+8р+16) : (2р-8)/(4+р)=(р-4)/((р+4)(р+4)) * (4+р)/2(р-4)=1/2(р+4)