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Mathematics, 01.09.2019 12:10 cougar9754

Indicate which property is illustrated in step 2.
step 1 9 + (5 + 7) + 0 = 9 + (7 + 5) + 0
step 2 = (9 + 7) + (5 + 0)
step 3 = (9 + 7) + 5
step 4 = 16 + 5

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Indicate which property is illustrated in step 2.
step 1 9 + (5 + 7) + 0 = 9 + (7 + 5) + 0
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