Lm giúp e cấu e vs ạ

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Lm giúp e cấu e vs ạ
lm-giup-e-cau-e-vs-a

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Khải Quang 4 years 2020-10-23T05:52:30+00:00 1 Answers 61 views 0

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  1. minhkhoi
    0
    2020-10-23T05:53:59+00:00
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    `e) (2/(\sqrt{5} + 2) – 1/(9 – 4\sqrt{5})) . (13 – sqrt{20})`

    `= [2/(\sqrt{5} + 2) – 1/((\sqrt{5} – 2)²)] . (13 – sqrt{20})`

    `= (2.(\sqrt{5} – 2)^2 – \sqrt{5} – 2)/((\sqrt{5} + 2)(\sqrt{5} – 2)^2) . (13 – sqrt{20})`

    `= (18 – 8\sqrt{5} – \sqrt{5} – 2)/(\sqrt{5} – 2) . (13 – sqrt{20})`

    `= (16 – 9\sqrt{5})/(\sqrt{5} – 2) . (13 – sqrt{20})`

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