а) 3x²-4x-(3x²-5x-(7x²-3))= =3x²-4x-(3x²-5x-7x²+3)= =
3x²-
4x-
3x²+
5x+
7x²-3 = =7x²+x-3б) (x³+2x²-(x+1)) -(x²-(7x³+2))= =(x³+2x²-x-1) - (x²-7x³-2) = =
x³+2x²-
x-1 - x²+
7x³+2 = =8x³ +x² -x+1в) -(12p⁴-(10p⁴-3p³-(7p²-4p³-(8p²-4p))))= = -(12p⁴-(10p⁴-3p³-(7p²-4p³-8p²+4p)))= = -(12p⁴-(10p⁴-3p³-7p²+4p³+8p²-4p))= = -(
12p⁴-
10p⁴+3p³+
7p²-4p³-
8p²+4p)= = -(2p⁴-p³-p²+4p)= =-2p⁴+p³+p²-4pг) 3.5n²-((11.4n⁴+1.3n⁵)-(7n⁴+2.5n³)+(3n⁴+(2n²-2n⁴)))= =3.5n²-(11.4n⁴+1.3n⁵-7n⁴-2.5n³+3n⁴+2n²-2n⁴)= =3.5n²-11.4n⁴
-1.3n⁵+7n⁴+
2.5n³-3n⁴-2n²+2n⁴= =-1.3n⁵-5.4n⁴+2.5n³+1.5n²д) 4x+(3x-(5x-(7x+5x²)+9x³)-3x³)= =4x+(3x-(5x-7x-5x²+9x³)-3x³)= =4x+(3x-5x+7x+5x²-9x³-3x³)= =
4x+3x-5x+7x+5x²
-9x³-3x³= =-12x³+5x²+9x