How to perform division of BigIntegers with bigger denominator than numerator and exponentiating it to 1/x where x is also biginteger -

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i trying solve equation = ( ( z/(u.s^v) ) ^ 1/e ) mod n, , variables bigintegers. denominator bigger numberator, numerator being 50 digits , denominator of above 250 digits. answer 0 division.

i tried bigdecimal well, gives me same problem.


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