In order to solve this problem, we must convert 1/2 and 5/7 into decimal form or convert 0.55 into fraction form. I'll convert 1/2 and 5/7 into decimal form because it is easier.
1/2 = 0.5
5/7 = 0.71
and 0.55 is given.
Now we have 0.5, 0.55, and 0.71, and it is easier to see the order of size.
0.5, 0.55, 0.71 is the order from least to greatest, but we must put 0.5 and 0.71 back into their original forms.
Therefore, the answer is 1/2, 0.55, 5/7
