Question

умоляю помогите 7 кл даю 30 б​

Answer 1

а) =у³-3•у²•3+3• у•3² -3³ +(3у)²-1²= = у³ - 9у²+ 27у- 27+9у²-1 =у³+27у-28

б)= х³+3•х²•2+3•х•4+2³- ((2х)²-3²)=

= х³+ 6х²+12х+8-4х²+9=х³ +2х²+12х+17