catwomn catwomn
  • 14-12-2017
  • Mathematics
contestada

Which of the following expressions is correct?
-(-21) = 21
-(21) = 21
-(-21) = -21
(-21) = 21

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Аноним Аноним
  • 14-12-2017
(-21)=21 is the correct answer

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Аноним Аноним
  • 18-12-2017
a is the correct answer 
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