Elaborar lo siguiente :1 + 2/1 - 3/2 + 4/3 - 5/4 + . . . - n/m

function math(n, m):
  for i in range(n):
    for j in range(m):
      if (i-j)%2 == 0:
        print(i+j)
      else:
        print(i-j)

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