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Efectuati:
(x+Y)(x-Y)
(c-b)(c+b)
(x+4)(x-4)
(8-a)(8+a)
(y-√3)(y+√3)
(√7-x)(x+√7)


Răspuns :

(x+Y)(x-Y)=x²-y
(c-b)(c+b)=c²-b²
(x+4)(x-4)=x²-16
(8-a)(8+a)=64-a²
(y-√3)(y+√3)=y²-3
(√7-x)(x+√7)
=7-x²