А) 17/16*15с/34ab=1/16*15c/2ab=15c/32ab
б) 3c*4d/c+2d* (2d-c)*(2d+c)/-2(-4d+3c)=2d-c/-2=с-2d/2
в) -(3х-2у)/х * 1/9х^2-4у^2=-(3х-2у)/х * 1/(3х-2у)*(3х+2у)=-1/х * 1/3х+2у=- 1/х*(3х+2у)=1/3х^2+2ху
г) p-4/(p+4)^2 * 4p+p^2/2p-8=p-4/(p+4)^2 * p*(4+p)/2(p-4)=1/p+4 * p/2=p/2(p+4)=p/2p+8