18-05-2014
Mathematics

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(12y2+17y-4)+9y2-13y+3)

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kate200468 kate200468

18-05-2014

\((12y^2+17y-4)+(9y^2-13y+3)=12y^2+9y^2+17y-13y-4+3=\\\\=21y^2+4y-1\)

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