Odpowiedź :
a) -2x-4y
b)2x-6-5x-2-3x=-6x-8
c)2x-6-2,5+0,5x+1,5=2,5x-7
d)8x²+2x-20x-5=8x²-18x-5
e)2(2x²+x-6x-3)=2(2x²-5x-3)=4x²-10x-6
f)-3(2x²+3x+10x+15)-(2x²-x+6x-3)=
=-6x²-39x-45-2x²-5x+3=-8x²-42x-42
b)2x-6-5x-2-3x=-6x-8
c)2x-6-2,5+0,5x+1,5=2,5x-7
d)8x²+2x-20x-5=8x²-18x-5
e)2(2x²+x-6x-3)=2(2x²-5x-3)=4x²-10x-6
f)-3(2x²+3x+10x+15)-(2x²-x+6x-3)=
=-6x²-39x-45-2x²-5x+3=-8x²-42x-42