$\frac{30}{11}$ × $\frac{66}{25}$ × $\frac{75}{210}$ = $\frac{30×66×75}{11×25×210}$
= $\frac{18}{7}$
($\frac{8}{11}$ + $\frac{3}{12}$) + $\frac{3}{11}$ = $\frac{8}{11}$ + $\frac{3}{12}$ + $\frac{3}{11}$ = ($\frac{8}{11}$ + $\frac{3}{11}$) + $\frac{3}{12}$ = $\frac{11}{11}$ + $\frac{3}{12}$ = 1 + $\frac{3}{12}$ = 1 + $\frac{1}{4}$ = $\frac{5}{4}$