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

Toán Lớp 6: 2 và 1/3 : 3/4 bằng 1/2 : (2x- 3)

Toán Lớp 6: 2 và 1/3 : 3/4 bằng 1/2 : (2x- 3)

Comments ( 2 )

  1. 2 1/3:(3/4)=1/2:(2x-3)
    =>7/3:(3/4)=1/2:(2x-3)
    =>28/9=1/2:(2x-3)
    =>1/2:(2x-3)=28/9
    =>(2x-3)=1/2:(28/9)
    =>(2x-3)=9/56
    =>2x=9/56+3
    =>2x=177/56
    =>x=177/56:2
    =>x=177/112 

  2. $2\dfrac{1}{3}:\dfrac{3}{4}=\dfrac{1}{2}:(2x-3)$
    $⇔\dfrac{7}{3}.\dfrac{4}{3}=\dfrac{1}{2}:(2x-3)$
    $⇔\dfrac{28}{9}=\dfrac{1}{2}:(2x-3)$
    $⇔2x-3=\dfrac{1}{2}:\dfrac{28}{9}$
    $⇔2x-3=\dfrac{9}{56}$
    $⇔2x=\dfrac{9}{56}+3$
    $⇔2x=\dfrac{177}{56}$
    $⇔x=\dfrac{177}{56} : 2$
    $⇔x=\dfrac{177}{112}$
    Vậy $x=\dfrac{177}{112}$

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