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Verify that: (i) ((-3)/(16)xx(8)/(15)...

Verify that:
`(i) ((-3)/(16)xx(8)/(15))=((8)/(15)xx(-3)/(16))`
(ii) `(2)/(3)xx((6)/(7)xx(-4)/(15))= ((2)/(3)xx(6)/(7))xx(-14)/(15)`
(iii) `(5)/(6)xx((-4)/(5)+(-7)/(10))=((5)/(6)xx(-4)/(5))+((5)/(6)xx(-7)/(10))`

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