Respuesta :

Answer:

171

Step-by-step explanation:

Recall order of operations.

PEMDAS = parentheses, exponents, multiply, divide, add, subtract

You can treat it like this to make it easier:

((9x9) +9) -9 + (99-9)

(81 + 9) - 9 + (90)

90 - 9 = 81

81 + 90 = 171

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