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ce formula are a la a-2a plus b la a -2-a?

Răspuns :

[tex](a +b)^{2} =[/tex][tex] a^{2} + 2ab + b^{2} [/tex]
a^2+b^2=(a+b)^2-2ab
a^2+b^2=(a-b)^2+2ab