me_lab9_9.py

from fractions import Fraction as f

import numpy as np

def ladder(a):
    # Приводим к ступенчатому виду
    n = len(a)
    m = len(a[0])
    # Ведущая строка k, Ведущий элемент q
    for k in range(n):
        for i in range(1+k, n):
            if not any(a[k]):
                a = np.append(a, [a[k]], axis=0)
                a = np.delete(a, k, axis=0)
                continue
            x = -a[i][k]/a[k][k]
            for j in range(m):
                a[i][j] = a[k][j]*x + a[i][j]
    return a

def format_mat(a):
    # Форматируем вывод матрицы
    return np.array([[f'{i}' for i in x] for x in a])

n = int(input())
A = np.array([[f(x) for x in input().split()] for i in range(n)])
m = len(A[0])
A = ladder(A)
print(format_mat(A))