Tính: a, \( \frac{2}{6} + \frac{5}{3} \); b, \( \frac{7}{2} \div \frac{1}{4} \); c, \( \frac{3}{10} \times \frac{5}{6} \); d, \( \frac{4}{7} : \frac{8}{14} \)

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Câu 11(Mức 1) Tính:
a, \( \frac{2}{6} + \frac{5}{3} \)
b, \( \frac{7}{2} \div \frac{1}{4} \)
c, \( \frac{3}{10} \times \frac{5}{6} \)
d, \( \frac{4}{7} : \frac{8}{14} \)