a) (a+b)-(2a-b) - (a-2b) = b) (3x-y+1)- (x+y) +(y-x) = c) - (kx+ny) - (3kx+2ny) + (5kx - ny) = d) (2ab +a+3)-(3ab-a+3) = e) (4x² - 3x) - (x+0,1x²)- (x² - 0,1x) = Z góry dziękuję za pomoc :P

(a+b)-(2a-b) - (a-2b) =a+b-2a+b-a+2b=a-3a+4b=-2a+4b (3x-y+1)- (x+y) +(y-x) =3x-y+1-x-y+y-x+y-x=x+1 - (kx+ny) - (3kx+2ny) + (5kx - ny) =-kx-ny-3kx-2ny+5kx-ny=kx-4ny (2ab +a+3)-(3ab-a+3) =2ab+a+3-3ab+a-3=-ab+2a (4x² - 3x) - (x+0,1x²)- (x² - 0,1x) =4x²-3x-x-0,1x²= 3,9x²-4x

a) a+b-2a+b-a+2b=2a+4b b) 3x-y+1-x-y+y-x=x-y+1 c)-kx-ny-3kx-2ny+5kx-ny=kx-4ny d) 2ab+a+3-3ab+a-3=-ab+2a