Odpowiedź:
a) (4x-2)+(5x+3) = 4x-2+5x+3 = 9x + 1
b) (y²+5y-6)+(2y²-y+8) = y²+5y-6+2y²-y+8 = 3y² + 4y + 2
c) (10a³-2b^4+c)+(-3a³-6b^4-c) = 10a³-2b^4+c-3a³-6b^4-c = 7a³ - 8b^4
d) (2x²+4x-3)+(-x²-2x+4) = 2x²+4x-3-x²-2x+4 = x² + 2x + 1
