RFRAN02
contestada

Indicate which property is illustrated in Step 1.

Step 1 8 + (5 + 9) + 0 = 8 + (9 + 5) + 0
Step 2 = (8 + 9) + (5 + 0)
Step 3 = (8 + 9) + 5
Step 4 = 17 + 5