Răspuns :
[tex]2 \frac{1}{5} \div 5 \frac{1}{2} = \frac{2 \times 5 + 1}{5} \div \frac{5 \times 2 + 1}{2} = \frac{11}{5} \div \frac{11}{2} = \frac{11}{5} \times \frac{2}{11} = \frac{2}{5} [/tex]
[tex]2 \frac{1}{5} \div 5 \frac{1}{2} = \frac{2 \times 5 + 1}{5} \div \frac{5 \times 2 + 1}{2} = \frac{11}{5} \div \frac{11}{2} = \frac{11}{5} \times \frac{2}{11} = \frac{2}{5} [/tex]