Find three key phrases which helped you understand the main idea in the recording. 1. a very poor second half for City

10c/(5c+2d)² * 2(5c+2d)/15cd=4/3(5c+2d)=4/(15c+6d)

10с/25с^2+20cd+4d^2 * 10c+4d/15cd = 10c*2(5c+2d)/(5c+2d)^2*15cd=
=4/3d(5c+2d)
при с=-1/3, d=1/3
4/3*1/3(5*(-1/3)+2*1/3)=4/-5/3+2/3=-4/1=-4