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

Toán Lớp 6: Tìm số tự nhiên x, biết: [3⁴-(8²+14):13]x=5³+10²

Toán Lớp 6: Tìm số tự nhiên x, biết: [3⁴-(8²+14):13]x=5³+10²

Comments ( 2 )

  1. $\text{[3⁴-(8²+14):13]x=5³+10²}$
    $\text{=[81−1 . (64+14)13]????=$5^{3}$ + $10^{2}$ }$ 
    $\text{=[81−1 ⋅ (64+14) : 13] x= $5^{3}$ + $10^{2}$  }$            
    $\text{=[81−1 ⋅ (78) : 13] x= $5^{3}$ + $10^{2}$ }$
    $\text{=[81−1 ⋅ 6] x= $5^{3}$ + $10^{2}$ }$
    $\text{= [81−6] x= $5^{3}$ + $10^{2}$ }$
    $\text{=[75]x= $5^{3}$ + $10^{2}$}$
    $\text{=75x=125+100}$
    $\text{=75x=225}$
     $\text{=$\frac{75x}{75}$ = $\frac{225}{75}$ }$  
    $\text{x=$\frac{225}{75}$ }$   
    $\text{ x = 3}$
    $\text{Vậy x=3}$
    $\text{#Karis257}$
                 
                  

  2. ~ gửi bạn ~
    Giải đáp:
    x = 3 
    Lời giải và giải thích chi tiết:
     [3^⁴-(8^²+14):13]*x=5^³+10^²
    ⇔ [81 -(64 + 14):13]*x = 125 + 100
    ⇔ [81 – 78 :13]*x = 225
    ⇔ [81 – 6]*x = 225
    ⇔ 75*x = 225
    ⇔ x = 3
    Vậy x = 3

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

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