2у²-5у+2=0
D=25-4×4=25-16=9=3²
у1=(5+3):4=2
у2=(5-3):4=0,5
2у²-5у+2=2(у-2)(у-0,5)
(9у²-4)/(2у²-5у+2) × (2-у)/(3у+2) + у/(1-2у)= - 2
1) [(3у-2)(3у+2)]/[(2(у-2)(у-0,5)] × (2-у)/(3у+2) = (3у-2)/ [-2(2-у)(у-0,5)] × (2-у) = (3у-2) / [-2(у-0,5)]
2) (3у-2) / [-2(у-0,5)] + у/(1-2у)= (3у-2)/(-2у+1) + у/(1-2у)= (3у-2)/(1-2у) + у/(1-2у)= (4у-2)/(1-2у)= 2(2у-1) / [-(2у-1)]=-2