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

Toán Lớp 5: Tìm x trong dãy tính sau: a) 2075 : 5=x*75/5+40 b) x + x : 5 * 7,5 + x : 2×9=315

Toán Lớp 5: Tìm x trong dãy tính sau:
a) 2075 : 5=x*75/5+40
b) x + x : 5 * 7,5 + x : 2×9=315

Comments ( 2 )

  1. a,     $\text{2075 : 5 = x.$\dfrac{75}{5}$+40}$
    <=>$\text{415 = x.15+40}$
    <=>$\text{x=25}$
    b.    $\text{x + x : 5 .7,5 + x : 2 .9 = 315}$
    <=>$\text{x + x. $\dfrac{3}{2}$+ x $\dfrac{9}{2}$ = 315}$
    <=>$\text{7x = 315}$
    <=>$\text{x=45}$

  2. $\textit{a) 2075 : 5 = X x 75/5 + 40}$
    $\textit{X x 75/5 + 40 = 415}$
    $\textit{X x 75/5 = 415 – 40}$
    $\textit{X x 75/5 = 375}$
    $\textit{X = 375 : 75/5}$
    $\textit{X = 25}$
    $\textit{b) X + X : 5 x 7,5 + X : 2 x 9 = 315}$
    $\textit{X + X x 1,5 + X x 4,5 = 315}$
    $\textit{X x ( 1 + 1,5 + 4,5 ) = 315}$
    $\textit{X x 7 = 315}$
    $\textit{X = 315 : 7}$
    $\textit{X = 45}$

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

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