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  • 14-02-2017
  • Mathematics
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(5+√ 5) x (1+√ 5)÷square root 5

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Аноним Аноним
  • 14-02-2017
= (5 + 5 sqrt5 + sqrt5 + 5) / sqrt5
= (10 + 6 sqrt5) / sqrt5
= 10 sqrt5 + 30
    ---------------
              5

=  2 sqrt5 + 6
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