Tính nhanh: 305 x 328 + 305 x 671 + 305

a) 305 328 + 305 671 + 305

= 305 $\times$ (238 + 671 + 1)

= 305 $\times$ 1000

= 305 000

b) \(\frac{{11}}{4} \times \frac{8}{{14}} \times \frac{7}{{11}} \times \frac{5}{3}\)= \(\frac{{11}}{4} \times \frac{4}{7} \times \frac{7}{{11}} \times \frac{5}{3} = \left( {\frac{{11}}{4} \times \frac{7}{{11}}} \right) \times \frac{4}{7} \times \frac{5}{3} = \frac{7}{4} \times \frac{4}{7} \times \frac{5}{3} = \frac{5}{3}\)