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(2/1-2/81)-1/1-1/81)=?

Răspuns :

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Vezi imaginea IWANTTOHELP

[tex]( \frac{2}{1} - \frac{2}{81} ) - ( \frac{1}{1} - \frac{1}{81} ) = \frac{160}{81} - \frac{80}{81} = \frac{80}{81} [/tex]