а) -2x^3-x^2+[
б) -12xy
в) 2a^3-3na-2n^3-na=2a^3-2n^3-4na
г) 12y^3+3y^2-2y^2+4y^2=12y^3+5y^2
4) -8b^4+16b^5
5) 2x^2+2x-8x+4x^2=6x^2-6x
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Answers & Comments
а) -2x^3-x^2+[
б) -12xy
в) 2a^3-3na-2n^3-na=2a^3-2n^3-4na
г) 12y^3+3y^2-2y^2+4y^2=12y^3+5y^2
4) -8b^4+16b^5
5) 2x^2+2x-8x+4x^2=6x^2-6x