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Desfaceti parantezele:
a)(2x-3y)(5x+7y-1)


Răspuns :

(2x-3y)(5x+7y-1) = 10x^2+14xy+2x-15xy-21y^2+3y=10x^2 -21y^2 +2x +3y - xy
(2x-3y)(5x+7y-1)=10x²-15xy+14xy-21y²-2x-3y=10x²xy-2x-3y-21y²