import numpy as np
a = np.array(3/7, dtype=np.float32)
b = np.array(713/999, dtype=np.float32)
c = np.array(7/11, dtype=np.float32)
print("{:30.26f}\n{:30.26f}".format((a + b) + c, a + (b + c)))
#   1.77864873409271240234375000
#   1.77864885330200195312500000