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

Toán Lớp 6: Tìm x: a. 71 – 9 33 + x ) = 3³ b. 24 + 5 x = 7 ⁵ : 7 ³

Toán Lớp 6: Tìm x: a. 71 – 9 33 + x ) = 3³ b. 24 + 5 x = 7 ⁵ : 7 ³

Comments ( 2 )

  1. a, 71 – 933 + x = 3^{3}
    $\Rightarrow$ -862 + x = 27
    $\Rightarrow$ x = 27 + 862
    $\Rightarrow$ x = 899
    $\text{Vậy}$ x = 899
    ______________
    b, 24 + 5x = 7^{5} : 7^{3}
    $\Rightarrow$ 24 + 5x = 7^{2}
    $\Rightarrow$ 24 + 5x = 49
    $\Rightarrow$ 5x = 49 – 24
    $\Rightarrow$ 5x = 25
    $\Rightarrow$ x = 25 : 5
    $\Rightarrow$ x = 5
    $\text{Vậy}$ x = 5

  2. a,71-933+x=3^3
    ⇒-862+x=27
    ⇒x=27-(-862)
    ⇒x=889
    b,24+5x=7^5 : 7^3
    ⇒24+5x=7^2
    ⇒24+5x=49
    ⇒5x=49-24
    ⇒5x=25
    ⇒x=25:5
    ⇒x=5
     

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