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Ajutor, Algebra, clasa a 7a, please

Ajutor Algebra Clasa A 7a Please class=

Răspuns :

x^2/9-y^2=[tex] x^{2} [/tex]/[tex] 3^{2} [/tex]=[tex] y^{2} [/tex]
(x/3-y)(x/3+y)

[tex] x^{2} [/tex]-[tex] y^{2} [/tex]=(x-y)(x+y)