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

Toán Lớp 6: Tìm số tự nhiên x,biết. 2.(x+5)-6²=68

Toán Lớp 6: Tìm số tự nhiên x,biết.
2.(x+5)-6²=68

Comments ( 2 )

  1. Answer
    2 . (x + 5) – 6^{2} = 68
    $\Rightarrow$ 2 . (x + 5) – 36 = 68
    $\Rightarrow$ 2 . (x + 5) = 68 + 36
    $\Rightarrow$ 2 . (x + 5) = 104
    $\Rightarrow$ (x + 5) = 104 : 2
    $\Rightarrow$ x + 5 = 52
    $\Rightarrow$ x = 52 – 5
    $\Rightarrow$ x = 47
    $\text{Vậy}$ x = 47

  2. $ 2 ( x + 5 ) – 6^{2} = 68 $
    ⇒ $ 2 ( x + 5 ) – 36 = 68 $
    ⇒ $ 2 ( x + 5 ) = 104 $
    ⇒ $ x + 5 = 52 $
    ⇒ $ x = 47 $
    Vậy $ x = 47 $

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