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-[tex] \frac{1}{2} - (- \frac{3}{7} ) ori \frac{7}{5} [/tex]

Răspuns :

1/2+(3/7*7/5)=1/2+3/5      amlific 1/2 cu 5     si 3/5   cu 2=>5/10+6/10=11/10