Mathematics, 05.01.2022 17:40 unkno

1. Which of the following statements is not always true? A. a + (-5) = -b + a
C. (a + b) + (-c) = a + [b + (-c)]
B. a - (-b) = (-b) - a
D. -(-a) = a

Answers: 3

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1. Which of the following statements is not always true? A. a + (-5) = -b + a
C. (a + b) + (...