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

Toán Lớp 7: (4x + 7)^3 – 206 = 3^2 . 5^3 ^ = là dấu mũ nhé

Toán Lớp 7: (4x + 7)^3 – 206 = 3^2 . 5^3
^ = là dấu mũ nhé

Comments ( 2 )

  1. Lời giải:
    (4x+7)^(3)-206=3^(2).5^3
    ⇒(4x+7)^(3)-206=9.125
    ⇒(4x+7)^(3)=1125+206
    ⇒(4x+7)^(3)=1331
    ⇒(4x+7)^3=11^3
    ⇒4x+7=11
    ⇒4x=11-7
    ⇒4x=4
    ⇒x=1
    Vậy x=1
     

  2. $\\$
    (4x+7)^3 – 206=3^2 . 5^3
    ->(4x+7)^3 – 206=9 . 125
    -> (4x+7)^3 – 206=1125
    ->(4x+7)^3=1125+206
    ->(4x+7)^3=1331
    ->(4x+7)^3=11^3
    ->4x+7=11
    ->4x=11-7
    ->4x=4
    ->x=4:4
    ->x=1
    Vậy x=1

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

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