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What's the answer to 4 and 5? in expression form like the previous ones in red pen

What's the answer to 4 and 5? in expression form like the previous ones in red pen-example-1

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4. Multiplicative Inverse of a Number. The reciprocal of x is . In other words, a reciprocal is a fraction flipped upside down. Multiplicative inverse means the same thing as reciprocal.
User Abhijit Muke
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