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1. (x-3) (x-7)=
2. (x+1) (1-3x)=
3. Completati urmatoarele expresii algebrice la patrat perfect:
a) x la a doua+...36
b) ...-6x+9
c) 9x la a doua+...+4


Răspuns :

1.x²-10x+21
2.-3x²-2x+1
3. a) x²+12x+36=(x+6)²
b) x²-6x+9=(x-3)²
c) 9x²+12x+4=(3x+2)²