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Verify the property: (x×y)×z=x×(y×z) by ...

Verify the property: `(x×y)×z=x×(y×z)` by taking:
(i) `x=7/3, y=(12)/5, z=4/9`
(ii)`x=0, y=(-3)/5, z=(-9)/4`

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(i) `x=7/3, y=(12)/5, z=4/9`
`=>[7/3 xx (12)/5] xx (4)/9=7/3 xx [(12)/5 xx (4)/9]`
`=>84/15 xx 4/9=7/3 xx 48/45`
`=>336/135=336/135`

(ii)`x=0, y=(-3)/5, z=(-9)/4`
`=>[0×(-3)/5] xx (-9)/4=0 xx [(-3)/5×(-9)/4]`
`=>0=0`
Hence Verified.
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