Answer :

Remember, a is called multiplicative inverse of b, if a × b = 1.


(–7)–2 ÷ (90)–1 =


=


=


(-a)m = am , if m is an even number and (-a)m =


Put b = in a × b = 1


a × = 1



The multiplicative inverse of (–7)–2 ÷ (90)–1 is


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