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

Toán Lớp 8: Tìm x biết `3/(x+4)` = `2/(2x+1)` Nhanh ak

Toán Lớp 8: Tìm x biết
3/(x+4) = 2/(2x+1)
Nhanh ak

Comments ( 2 )

  1. $\dfrac{3}{x+4}$ = $\dfrac{2}{2x+1}$ x≠-4 và x≠-1/2
    ⇔ (2x+1).3=2(x+4)
    ⇔ 6x+3=2x+8
    ⇔ 4x=5
    ⇔ x=5/4( tm)

  2. (3)/(x+4)=(2)/(2x+1) (xne-4,xne-1/2)
    ⇔3(2x+1)=2(x+4)
    ⇔6x+3=2x+8
    ⇔6x-2x=8-3
    ⇔4x=5
    ⇔x=5/4 ™
    Vậy x=5/4
     

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

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