zad21 a) (a+b)-(2a-b)-(a-2b)= b) (3x-y+1)-(x+y)+(y-x)= c) -(kx+ny)-(3kx+2ny)+(5kx-3ny)= d) (2ab+a+3)-(3ab-a+3)= e) (4x2-3x)-(x+0,1x2)-(x2-0,1x)= to z matmy proszę to na jutro

a)(a+b)-(2a-b)-(a-2b)=a+b-2a+b-a+2b=2a+4b b)(3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1 c) -(kx+ny)-(3kx+2ny)+(5kx-3ny)=-kx-ny-3kx-2ny+5kx-3ny=2ks-6ny d)(2ab+a+3)-(3ab-a+3)=2ab+a+3-3ab+a-3=-ab+2a e)  (4x²-3x)-(x+0,1x²)-(x²-0,1x)=4x²-3x-x-0,1x²-x²+0,1x=1,9x²-3,9x

a) =a b) =x c) =n d) =ab e) =x