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(1-3supra 4)^-2
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Răspuns :

Ai formula [tex] a^{-k}= \frac{1}{ a^{k} },si, (\frac{a}{b}) ^{-k}= ( \frac{b}{a}) ^{k} [/tex], deci [tex] (1- \frac{3}{4}) ^{-2}= (\frac{1}{4}) ^{-2}= (\frac{4}{1})^2=16 [/tex]