B = $\frac{5}{6}$ + 6$\frac{5}{6}$ x ( 11$\frac{5}{20}$ - 9$\frac{1}{4}$ ) : 8$\frac{1}{3}$
B = $\frac{5}{6}$ + $\frac{41}{6}$ x {2( $\frac{5}{20}$ - $\frac{1}{4}$ )} : $\frac{25}{3}$
B = $\frac{5}{6}$ + $\frac{41}{6}$ x 2 : $\frac{25}{3}$
B = $\frac{5}{6}$ + $\frac{41}{3}$ : $\frac{25}{3}$
B = $\frac{5}{6}$ + $\frac{41}{3}$ x $\frac{3}{25}$
B = $\frac{5}{6}$ + $\frac{41}{25}$
B = $\frac{371}{150}$
XIN HAY NHẤT^^
$@MaiChi$