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1. (3xy+2x²y²-4)+(-9xy+7x²y²+10) =
2. (3xy+2x²y²-4)-(-9xy+7x²y²+10) =





Răspuns :

3xy+2x²y²-4-9xy+7x²y²+10 = 9x²y²-6xy+6 / :3 = 3x²y²-2xy+2
3xy+2x²y²-4+9xy-7x²y²-10 = 12xy-5x²y²-14