lisa143 lisa143
  • 31-08-2017
  • Mathematics
contestada

(17+4) + 9 = 17 + (4+9)

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apologiabiology
apologiabiology apologiabiology
  • 31-08-2017
that's the associative property of addition

it is normally written as
(a+b)+c=a+(b+c)
which is like what you have
(17+4)+9=17+(4+9)
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