(7-3у)(4+2у-4)=7(3+2у-4)-3у(4+2у-4)=28+14у-28-12у-6у²+12у=14у-6у²,при у=5
14×5-6×5²=70-6×25=70-150=-80
(7-3у)(4+2у-4)=7(3+2у-4)-3у(4+2у-4)=28+14у-28-12у-6у²+12у=14у-6у²,при у=5
14×5-6×5²=70-6×25=70-150=-80