usun nawiasy i zredukuj wyrazy podobne a)2x-7-[5x²-3x-(2-4x+x²)] b)3-x²-[2-2x²-(3x²-2x+1)] c)4x+3-[x-3x²-(6-3x-x²)] d)3x²-5x-[1-3x-(2+4x-x²)]

a)2x-7-[5x²-3x-(2-4x+x²)]= 2x-7-[5x²-3x-2+4x-x²]= 2x-7-5x²+3x+2-4x+x²= x-5-4x² b)3-x²-[2-2x²-(3x²-2x+1)]= 3-x²-[2-2x²-3x²+2x-1]= 3-x²-2+2x²+3x²-2x+1= 2+4x²-2x c)4x+3-[x-3x²-(6-3x-x²)]= 4x+3-[x-3x²-6+3x+x²]= 4x+3-x+3x²+6-3x-x²= 9+2x² d)3x²-5x-[1-3x-(2+4x-x²)] = 3x²-5x-[1-3x-2-4x+x²]= 3x²-5x-1+3x+2+4x-x²= 2x²+2x+1

a)2x-7-[5x²-3x-(2-4x+x²)]= 2x-7-[5x²-3x-2+4x-x²]= 2x-7-5x²+3x+2-4x+x²= x-5-4x² b)3-x²-[2-2x²-(3x²-2x+1)]= 3-x²-[2-2x²-3x²+2x-1]= 3-x²-2+2x²+3x²-2x+1= 4x²-2x c)4x+3-[x-3x²-(6-3x-x²)]= 4x+3-[x-3x²-6+3x+x²]= 4x+3-x+3x²+6-3x-x²= 9-2x² d)3x²-5x-[1-3x-(2+4x-x²)] = 3x²-5x-[1-3x-2-4x+x²]= 3x²-5x-1+3x+2+4x-x²= 2x²=2x+1