$\frac{5}{14}$ × $\frac{7}{15}$ × $\frac{28}{7}$
= $\frac{5}{14}$ × $\frac{7}{15}$ × 4
= $\frac{5}{14}$ × $\frac{28}{15}$
= $\frac{140}{210}$ = $\frac{2}{3}$
($\frac{1}{2}$ +$\frac{3}{4}$) + 4
= $\frac{4}{5}$ + 4
= $\frac{21}{4}$
($\frac{5}{7}$ + $\frac{1}{4}$) × 7
= $\frac{27}{28}$ × 7
= $\frac{27}{4}$
$\frac{22}{5}$ × 12 × $\frac{5}{12}$
= $\frac{22}{5}$ × $\frac{5}{12}$ × 12
= $\frac{11}{6}$ × 12
= 22
$\frac{1}{2}$ × $\frac{3}{4}$ + $\frac{1}{2}$ × $\frac{1}{4}$
= $\frac{1}{2}$ × ($\frac{3}{4}$ + $\frac{1}{4}$)
= $\frac{1}{2}$ × 1
= $\frac{1}{2}$
$\frac{7}{2}$ × $\frac{7}{15}$ × $\frac{28}{7}$
= $\frac{7}{2}$ × $\frac{7}{15}$ × 4
= $\frac{49}{30}$ × 4
= $\frac{98}{15}$
$\frac{11}{3}$ × $\frac{26}{7}$ + $\frac{26}{7}$ + $\frac{8}{3}$
= $\frac{26}{7}$ × ($\frac{11}{3}$ × 1) + $\frac{8}{3}$
= $\frac{26}{7}$ × $\frac{14}{3}$ + $\frac{8}{3}$
= $\frac{58}{3}$ + $\frac{8}{3}$
= 20
