М) 1/4 - 4/57 + 16/71 + (4 - 1 2/3)(16/71 + 2/27 - 4 1/2)

1/4 - 4/57 + 16/71 + (4 - 1 2/3)(16/71 + 2/27 - 4 1/2) = 1/4 - 4/57 + 16/71 + (13/3)(16/71 + 2/27 - 9/2) = result not simplified due to long computation