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: Tìm x $\frac{x-3}{x+5}=$ $\frac{5}{7}$

Toán Lớp 7: Tìm x
$\frac{x-3}{x+5}=$ $\frac{5}{7}$

Comments ( 2 )

  1. (x-3)/(x+5)=5/7 (xne-5)
    ⇔7(x-3)=5(x+5)
    ⇔7x-21=5x+25
    ⇔7x-5x=25+21
    ⇔2x=46
    ⇔x=23 ™
    Vậy x=23

  2. Giải đáp:x-3/x+5=5/7
    ⇔(x-3)×7/(x+50)×7=5×(x+5)/7×(x+5)
    ⇔7x-21/7x+150=5x+25/7x+35
    ⇔7x-21/7x+150   +5x+25/7x+35=0
    ⇔7x-21+5x+25=0
    ⇔12x=4
    ⇔x=1/3
    vậy :x=1/3
     
    Lời giải và giải thích chi tiết:
     

Leave a reply

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