a)=27y+9-6y²-2y= -6y²+25y+9.
б)=2a³-2a+2-a^4+a²-a=-a^4+2a³+a²-3a+2.
в)=n³-n²-2n-n^4+n³+2n²+n²-n-2= -n^4+2n³+3n²-3n-2.
a)=27y+9-6y²-2y= -6y²+25y+9.
б)=2a³-2a+2-a^4+a²-a=-a^4+2a³+a²-3a+2.
в)=n³-n²-2n-n^4+n³+2n²+n²-n-2= -n^4+2n³+3n²-3n-2.