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-(a-5)(a+3)-(1-a)la patrat=?
(x-1)(x-2)-(x-4)la patrat=?
(2a+0,5)la patrat-(0,5-2a)la patrat=?
(3-2x)(3+2x)+5x la patrat=?
25x la patrat+(7+5x)(7-5x)=?
URGENT VA ROG FRUMOS!!!!


Răspuns :

-(a^2+3a-5a-15)-(1-2a+a^2)=0
-(a^2-2a-15)-1+2a-a^2=0
-a^2+2a+15-1+2a-a^2=0
-2a^2+4a+14=0
-a^2+2a+7=0