Zredukuj wyrazy podobne a) 12 - 4a + 5b - 7 - (-5a) - 4b - 5 b) 5a³ - 2ax³ + 2ax³ - a³x - 4a³ c) -(3x + 3) - [-(5x - 5) + (4x - 4)] d) 4x²y - 2xy² + 3xy + ¼x²y + 8yx - 12y²x

a) 12 - 4a + 5b - 7 - (-5a) - 4b - 5==-4a+5a+5b-4b+12-7-5=a+b b) 5a³ - 2ax³ + 2ax³ - a³x - 4a³=5a³-4a³-a³x=a³-a³x=a³(1-x) c) -(3x + 3) - [-(5x - 5) + (4x - 4)]=-3x-3-[-5x+5+4x-4]=-3x-3-[-x+1]=-3x-3+x-1=-2x-4 d) 4x²y - 2xy² + 3xy + ¼x²y + 8yx - 12y²x =4x²y+1/4x²y+3xy+8xy-2xy²-12y²x= 4 1/4 x²y+11 xy-14xy²