Question

6.how many rational numbers are there whose reciprocal do not exist?

7.write the rational number which is equal to its additive inverse.

8.if we include 0 then the collection of all others rational number is closed under division is it true.

9.negative of the negative of a rational number is the number itself is it true.

10.the reciprocal of a positive rational number is ....... and the reciprocal of a negative number is ..........
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Answer 1

1. 1 and -1
2. 0
3. false
4. true
5. positive, negative