`5/14 \times 7/15 \times 28/7`

`= {5 \times 7 \times 4}/{14 \times 15}`

`= 4/{2 \times 3}`

`= 4/6 = 2/3`.

`(1/2 + 3/4) + 4`

`= (2/4 + 3/4) + 4`

`= 5/4 + 4`

`= 4 5/4`.

`2/3 \times 10/21 \times 3/2`

`= {2 \times 10 \times 3}/{3 \times 21 \times 2}`

`= 10/21`.

`(5/7 + 1/14) \times 7`

`= (10/14 + 1/14) \times 7`

`= 11/14 \times 7`

`= 11/2`

`22/5 \times 12 \times 5/12`

`= {22 \times 12 \times 5}/{5 \times 12}`

`= 22`.

`1/2 \times 3/4 + 1/2 \times 1/4`

`= 1/2 \times (3/4+1/4)`

`= 1/2 \times 1`

`= 1/2`.

`7/2 \times 7/15 \times 28/7`

`= {7 \times 7 \times 28}/{2 \times 15 \times 7}`

`= {7 \times 14}/15`

`= 98/15`.

`11/3 \times 26/7 + 26/7 + 8/3`

`= 26/7 \times (11/3 + 1) + 8/3`

`= 26/7 \times 14/3 + 8/3`

`= 52/3 + 8/3 = 60/3 = 20`.

$\frac{5}{14}$ × $\frac{7}{15}$ × $\frac{28}{7}$

= $\frac{5}{14}$ × $\frac{7}{15}$ × 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