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Edana Edana
Edana Edana

Edana Edana

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Edana Edana
Asked: Tháng Mười 23, 20202020-10-23T15:05:27+00:00 2020-10-23T15:05:27+00:00In: Môn Toán

căn bậc hai của a cộng 2a bằng bao nhiêu

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căn bậc hai của a cộng 2a bằng bao nhiêu

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    1. Doris

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      Doris
      2020-10-23T15:07:10+00:00Added an answer on Tháng Mười 23, 2020 at 3:07 chiều

      Đáp án

      √3a

      giải thích cách giải 

      $\sqrt[]{a+2a}$

      =$\sqrt[]{3a}$

       

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    2. Hưng Khoa

      Hưng Khoa

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      dangkhoa
      2020-10-23T15:07:13+00:00Added an answer on Tháng Mười 23, 2020 at 3:07 chiều

      ĐK: $a\ge 0$

      – Nếu là $\sqrt{a+2a}$:

      $\sqrt{a+2a}$

      $=\sqrt{3a}$

      – Nếu là $\sqrt{a}+2a$:

      $\sqrt{a}+2a$

      $=\sqrt{a}+2\sqrt{a}.\sqrt{a}$

      $=\sqrt{a}(1+2\sqrt{a})$

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