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

Toán Lớp 5: y : 1000 + y x 0,099 = `42/5` x 5% Rất gấp

Toán Lớp 5: y : 1000 + y x 0,099 = 42/5 x 5%
Rất gấp

Comments ( 2 )

  1. $y : 1000 + y × 0,099 = \dfrac{42}{5} × 5%$
    $y × 0,001 + y × 0,099 = 42%$
    $y × ( 0,001 + 0,099 ) = 0,42$
    $y × 0,1 = 0,42$
    $y = 0,42 : 0,1$
    $y = 4,2$
    Vậy y=4,2

  2. $\text{y : 1000 + y × 0,099 = $\dfrac{42}{5}$ × 5%}$
    $\text{y × 0,001 + y × 0,099 = 42%}$
    $\text{y × ( 0,001 + 0,099 ) = 0,42}$
    $\text{y × 0,1 = 0,42}$
    $\text{y = 0,42 : 0,1}$
    $\text{y = 4,2}$

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

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