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Redu termeni asemena in urmatoarele cazuri :7a+3b-5b-8a =
10x²+5x-1-18x²-3x+8=
2x²+y²-4xy-4y²+xy--x³y+x²y²+x³y+2xy+1-2xy=

Calculati:
(x+2)(x+3)=
(x-1)(x-4)=
(x+5)(x²+xy+y²​


Răspuns :