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

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

Home/ Toán Lớp 7: $\frac{x-3}{x-5}$ =$\frac{5}{7}$

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

Tháng Bảy 12, 2022 Toán học 2 Comments 0 views

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

Comments ( 2 )

  1. ankim
    ankim
    12 Tháng Bảy, 2022 at 5:22 sáng
    Reply
    x-3/x-5=5/7
    ⇒5*(x-5)=7*(x-3)
    ⇒5x-25=7x-21
    ⇒5x-7x=-21+25
    ⇒-2x=4
    ⇒x=-2
    Vậy x=-2

  2. tongtung
    tongtung
    12 Tháng Bảy, 2022 at 5:21 sáng
    Reply
    \color{Red}{\text{Apple}}
    {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 = -4
    $\Rightarrow$ x = -4 : 2
    $\Rightarrow$ x = – 2
    $\text{Vậy}$ x = – 2

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

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