Write each of the following rational numbers with positive denominators.
5−8,15−28,−17−13
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Solution
We can write, 5−8=5×(−1)−8×(−1)=−58 15−28 can be written as =15×(−1)−28×(−1)=−1528
and −17−13 can be written as =−17×(−1)−13×(−1)=1713 as both negative signs are cancelled.