1.Usuń nawiasy i zredukuj wyrazy podobne : a) (3m - 2n) + (4m - 3n) b) (x² - 2xy) - (y²-2xy + x²) c)  -(2x + 3y + 4) - (-x + y -2)

3m-2n+4m-3n x2-2xy-y2+2xy-x2 -2x-3y-4+x-y+2

a) (3m-2n)+(4m-3n)=3m-2n+4m-3n=7m-5n b)(x²-2xy)-(y²-2xy+x²)=x²-2xy-y²+2xy-x²=-y² c)-(2x+3y+4)-(-x+y-2)=-2x-3y-4+x-y+2=x-4y-2