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

Toán Lớp 6: Tìm x thuộc N,biết :(7x-46)^3=2^5×5^2+200

Toán Lớp 6: Tìm x thuộc N,biết :(7x-46)^3=2^5×5^2+200

Comments ( 2 )

  1. Giải đáp:
    (7x-46)^3=2^5×5^2+200
    (7x-46) ^3=32×25+200
    (7x-46) ^3= 800+200
    (7x-46) ^3=1000
    (7x-46) ^3=10^3
    => 7x-46 = 10
    => 7x= 10+46
    => 7x= 56
    => x= 8
    vậy x=8
    xin CTLHN
     

  2.     $\text{(7x – 46)³= 2⁵× 5²+ 200}$
    $\text{⇔ (7x – 46)³= 32 × 25 + 200}$
    $\text{⇔ (7x – 46)³= 800 + 200}$
    $\text{⇔ (7x – 46)³= 1000}$
    $\text{⇔ (7x – 46)³= 10³}$
    $\text{⇔ 7x – 46   = 10}$
    $\text{⇔ 7x          = 10 + 46}$
    $\text{⇔ 7x          = 56}$
    $\text{⇔ x            = 56 : 7}$
    $\text{⇒ x            = 8}$
    $\text{⇒ Vậy x=8}$
    $\text{@Ched         –         Hoidap247}$
    $\text{Xin hay nhất với 5* ạ!!}$

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