Zad 1
a) (2y-7)(y+3)=2y²+6y-7y-21=2y²-y-21
b)(12x-16x):4-(6x+8y):2= 3x-4x-3x-4y=-4x-4y
Zad 2
11-2=9 k=9
2k+1=-1-2=-3 k= -3
-k+1=-1 k=1
Zad 3
=-8x5y³
