Answer:
(i) Zero has no reciprocal. (ii) The numbers 1 and ?1 are their own reciprocals. (iii) The reciprocal of ? 5 is \[-\frac{1}{5}\]. (iv) Reciprocal of \[\frac{1}{x},\] where \[x\ne 0\] is \[x\]. (v) The product of two rational numbers is always a rational number. (vi) The reciprocal of a positive rational number is positive.
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