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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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