Question

[Bùi Thị Phương Uyên]

tính

\(a,\left(\frac{51}{56}+\frac{8}{21}+\frac{16}{48}\right).\frac{32}{65}\)

\(b,\left(\frac{31}{20}-\frac{26}{45}\right).\frac{36}{49}\)

\(c,\frac{5}{39}.\left(7\frac{4}{5}.1\frac{2}{3}+8\frac{1}{3}.7\frac{4}{5}\right)\)