c1
`(2/5xx1/2)xx5/8`
`=1/5xx5/8`
`=1/8`
c2
`(2/5xx1/2)xx5/8`
`=2/5xx1/2xx5/8`
`=(2/5xx5/8)xx1/2`
`=1/4xx1/2`
`=1/8`
`(2/5xx1/2)xx5/8`
`= 2/10 xx 5/8`
`=1/5 xx 5/8`
`= 5/40`
`=1/8`
__
`(2/5 xx 1/2) xx 5/8`
`=2/5 xx (1/2 xx 5/8)`
`= 2/5 xx 5/16`
`= 10/80`
`=1/8`
`(2/5xx1/2)xx5/8`
`=1/5xx5/8`
`=1/8`
__
`(2/5xx1/2)xx5/8`
`=2/5xx1/2xx5/8`
`=2/10xx5/8`
`=1/5xx5/8`
`=1/8`
\(C_1:\\ \left(\dfrac{2}{5}\cdot\dfrac{1}{2}\right)\cdot\dfrac{5}{8}=\dfrac{1}{5}\cdot\dfrac{5}{8}=\dfrac{1}{8}\\ C_2:\\ \left(\dfrac{2}{5}\cdot\dfrac{1}{2}\right)\cdot\dfrac{5}{8}=\dfrac{2}{5}\cdot\dfrac{1}{2}\cdot\dfrac{5}{8}=\left(\dfrac{2}{5}\cdot\dfrac{5}{8}\right)\cdot\dfrac{1}{2}=\dfrac{1}{4}\cdot\dfrac{1}{2}=\dfrac{1}{8}\)