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Dmitrij

4. (21 + 3) + 7 -5 + (45 + 5) + 9 =​

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Answer:

R=85

1-primero se hacen lo que esta dentro de los incisos y después la suma y la resta.

(24) + 7 -5 + (50) + 9=

2-                24 + 7 -5 + 50 + 9=85

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