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(1-\frac{2}{7} ) ^{2} [/tex]





Răspuns :

[tex](1-\frac{2}{7} ) ^{2} = (\frac{7}{7}-\frac{2}{7} ) ^{2}= (\frac{5}{7} )^2= \frac{5^2}{7^2} = \frac{25}{49} [/tex]