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

Toán Lớp 7: Tìm x trong tỉ lệ thức sau $\frac{1}{5}$.x : 3 = $\frac{2}{3}$ : 0,25

Toán Lớp 7: Tìm x trong tỉ lệ thức sau
$\frac{1}{5}$.x : 3 = $\frac{2}{3}$ : 0,25

Comments ( 2 )

  1. $\dfrac{1}{5}.x:3=$$\dfrac{2}{3}:0,25$
    ⇒$\dfrac{1}{5}.x:3=$$\dfrac{8}{3}$
    ⇒$\dfrac{1}{5}.x=$$\dfrac{8}{3}.3$
    ⇒$\dfrac{1}{5}.x=8$
    ⇒$x=8:\dfrac{1}{5}$
    ⇒\text{x=40}
    \text{#mct}

  2. Giải đáp:
    $\ x=40$
    Lời giải và giải thích chi tiết:
    $\dfrac{1}{5}.x:3=$$\dfrac{2}{3}:0,25$
    $\Rightarrow$$\dfrac{1}{5}.x:3=$$\dfrac{8}{3}$
    $\Rightarrow$$\ x:3=$ $\dfrac{8}{3}:$$\dfrac{1}{5}$
    $\Rightarrow$$\ x:3=$ $\dfrac{40}{3}$
    $\Rightarrow$$\ x=$ $\dfrac{40}{3}.3$
    $\Rightarrow$$\ x=40$
    Vậy $\ x=40$
     

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