Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: √9???? − 18 − 2√4???? − 8 = 12 − √25???? − 50 helpppp

Toán Lớp 9: √9???? − 18 − 2√4???? − 8 = 12 − √25???? − 50
helpppp

Comments ( 1 )

  1. Giải đáp: + Lời giải và giải thích chi tiết:
    $\sqrt{9x – 18} – 2\sqrt{4x – 8} = 12 – \sqrt{25x – 50}$  ($x ≥2$) 
    $⇔ \sqrt{9(x-2)} –  2.\sqrt{4(x-2)}  -( 12 – \sqrt{25(x-2)}$$) = 0$
    $⇔ 3\sqrt{x-2} – 4\sqrt{x-2} – 12 + 5\sqrt{x-2} = 0$
    $⇔ (3-4+5). \sqrt{x-2} – 12 = 0$
    $⇔ 4\sqrt{x-2} = 12$
    $⇔ \sqrt{x-2} = 3$
    $⇒$ $(\sqrt{x-2})^2 = 3^2$
    $⇔ x-2 = 9$
    $⇔ x=11$
      Vậy S = {11}.
     

Leave a reply

222-9+11+12:2*14+14 = ? ( )