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

Toán Lớp 5: 30% x X + X =52 Giải giúp mình với

Toán Lớp 5: 30% x X + X =52
Giải giúp mình với

Comments ( 2 )

  1. 30%xx x+x=52
    (30)/(100)xx x+x=52
    3/(10)xx x+x=52
    x xx(3/(10)+1)=52
    x xx(3/(10)+(10)/(10))=52
    x xx(13)/(10)=52
    x=52:(13)/(10)
    x=52xx(10)/(13)
    x=40
    Vậy x=40

  2. $\text{30% × x + x = 52}$
    $\text{$\dfrac{3}{10}$ × 2 × x = 52}$
    $\text{ x × }$ (3/10 + 1) $\text{= 52}$
    $\text{ x × $\dfrac{13}{10}$ = 52}$
    $\text{ x = 52 ÷ $\dfrac{13}{10}$}$
    $\text{ x = 40}$
     

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

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