nie wiem czy dobrze, ale...
a)... = x^3+2x^2+x+2x-4x^2+2x= x^3 - 2x^2+6x
b)...= (12b^2-12b)/4 + (14b^2-28b)/2 - (b-b^2)/3 --> wszystko razy 12 i wychodzi tak: 36b^2-36b+84b^2-168b-4b-4b^2= 124b^2-208b
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nie wiem czy dobrze, ale...
a)... = x^3+2x^2+x+2x-4x^2+2x= x^3 - 2x^2+6x
b)...= (12b^2-12b)/4 + (14b^2-28b)/2 - (b-b^2)/3 --> wszystko razy 12 i wychodzi tak: 36b^2-36b+84b^2-168b-4b-4b^2= 124b^2-208b