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: tìm x √4x – 8 + 1/5 . √25x – 50 – √x-2=4

Toán Lớp 9: tìm x
√4x – 8 + 1/5 . √25x – 50 – √x-2=4

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    ĐKXĐ : x>=2
    sqrt(4x-8)+1/5 . sqrt(25x-50) – sqrt(x-2)=4
    <=> sqrt(4(x-2))+1/5 . sqrt(25(x-2)) – sqrt(x-2)=4
    <=> sqrt4 . sqrt(x-2) + 1/5 . sqrt25 . sqrt(x-2) – sqrt(x-2) = 4
    <=> 2 sqrt(x-2) + sqrt(x-2) – sqrt(x-2) = 4
    <=> 2 sqrt(x-2) = 4
    <=> sqrt(x-2) = 2
    <=> x-2 = 4
    <=> x=6 \ \ \ \ \ text{(tm)}
    Vậy S={6}

  2. \qquad sqrt{4x-8}+1/5sqrt{25x-50}-sqrt{x-2}=4 ĐK:x>=2
    <=> sqrt{4(x-2)}+1/5sqrt{25(x-2)}-sqrt{x-2}=4
    <=> 2sqrt{x-2}+1/5. 5sqrt{x-2}-sqrt{x-2}=4
    <=> sqrt{x-2}+sqrt{x-2}=4
    <=>2sqrt{x-2}=4
    <=> sqrt{x-2}=2
    <=> x-2=4
    <=> x=6 (\text{tm})
    Vậy S={6}
     

Leave a reply

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

About Audrey