Question:
By what number should (5/7)-5 (-5here is in exponential form) be multiplied so that the product is 1.
Answer:
Let that number is x
Now, x * (5/7)-5 = 1
=> x/ (5/7)5 = 1 {since a-1 = 1/a}
=> x = 1 * (5/7)5
=> x = (5/7)5
So, the number is (5/7)5
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