Working with matrices "invalid value encountered in double_scalars"

I am working with matrices and to solve systems of equations, in one part of the code I have

    factor = (matriz_v[f,k]/matriz_v[k,k])

where I get the error "invalid value encountered in double_scalars"

I think it's because he's working with very small values and python is equaling them to zero and since division does not exist for zero I get the error

I want to know how I do to work with all the decimals

I found that using

from mpmath import mp

but I do not know how to put it in the operation above

I hope you can help me, thank you