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 7: (x+2)/15 + (x+2)/16 + (x+2)/17 = (x+2)/18 + (x+2)/19

Toán Lớp 7: (x+2)/15 + (x+2)/16 + (x+2)/17 = (x+2)/18 + (x+2)/19

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    (x+2)/15 + (x+2)/16 + (x+2)/17 = (x+2)/18 + (x+2)/19
    <=> ( x + 2 ) ( 1/15 + 1/16 + 1/17 – 1/18 – 1/19 ) = 0
    => x + 2 = 0
    => x = 0 – 2
    => x = -2

  2. (x+2)/15 + (x+2)/16 + (x+2)/17 = (x+2)/18 + (x+2)/19
    <=> (x+2)/15 + (x+2)/16 + (x+2)/17 – (x+2)/18 – (x+2)/19 = 0
    <=> (x+2)(1/15 + 1/16 + 1/17 – 1/18 – 1/19) = 0
    Dễ thấy 1/15 + 1/16 + 1/17 – 1/18 – 1/19≠0
    => x + 2 = 0
    <=> x = -2
    Vậy x = -2

Leave a reply

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

About Kim Dung