XiaoRing XiaoRing
  • 25-08-2018
  • Mathematics
contestada

no.1 and no.2 how to do?

no1 and no2 how to do class=

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Аноним Аноним
  • 25-08-2018

81 * 1 / 27^y = 9 ^2y+1

81 * 1 / 9^3y/2 = 9 ^ 2y+1

9^3y/2 * 9 ^ (2y+1) = 81

9 ^ ( 3y/2 + 2y + 1) = 81 = 9^2

3y/2 + 2y + 1 = 2

7y/2 = 2 -1 = 1

7y = 2

y = 2/7 answer


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