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

Toán Lớp 7: Tìm x , biết : x-3 / x+5 = 5/7 Giúp vs ạ

Toán Lớp 7: Tìm x , biết : x-3 / x+5 = 5/7
Giúp vs ạ

Comments ( 2 )

  1. Giải đáp:
    x = 23
    Giải thích:
    \frac{x – 3}{x + 5} = 5/7
    => 7.(x – 3) = 5.(x + 5)
    => 7x – 21 = 5x + 25
    => 7x – 5x = 25 + 21
    => 2x = 46
    => x = 23
    Vậy x = 23

  2. Answer
    {x-3}/{x+5} = 5/7
    $\Rightarrow$ 7 . (x – 3) = 5 . (x + 5)
    $\Rightarrow$ 7x – 21 = 5x + 25
    $\Rightarrow$ 7x – 5x = 25 + 21
    $\Rightarrow$ 2x = 46
    $\Rightarrow$ x = 46 : 2
    $\Rightarrow$ x = 23
    $\text{Vậy}$ x = 23
     

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