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calculati (3 supra 5 x 2 supra 7) x 21 supra 18=



Răspuns :

([tex] \frac{3*2}{5*7} * \frac{21}{18} = \frac{6}{35} * \frac{21}{18} = \frac{3}{5} * \frac{3}{9} = \frac{3}{5*3} = \frac{1}{5} [/tex]