1)у*у²+3 у=у³+3 у
2)у*у³+3 у=у⁴+3 у
3)у³+у³*у²=у³+у⁵
4)3у*у²+3у=3у³+3у
<span>(x-2)^3 -27=(x-2)^3-3^3=(x-2-3)((x-2)^2+3(x-2)+3^2)=(x-5)(x</span>²-4x+4+3x-6+9<span>)=(x-5)(x</span>²-7x+7<span>)</span>
Б 10....................................................................................................................................................
У=x^2-6х-7
D=36+28=64, х₁=14, х₂=-2