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⇒ [Using -n = ]
Express each of the following as a rational number of the form, where p and q are integers and q0:
Find the values of each of the following:
By what number should 5-1 be multiplied so that the product many be equal to (-7)-1?
By what number should be multiplied so that the product may be equal to ?
By what number should (-15)-1 be divided so that the quotient may be equal to (-5)-1?