Convert the mixed fraction to an improper fraction. Then you can simply exchange the numerator and the denominator.
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3 and a half = 7/2 so its multiplicative inverse is 2/7.
2 1/3 = 7/3 inverse of 7/3 is 3/7
-3/2
No, it is not. 3/5 is rational and its multiplicative inverse is 5/3 which is not an integer.
find the inverse of (1,-5)(3,-3)(4,-2)