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

Toán Lớp 6: (3x-14)^3-14=2×5^2 Giúp em vs pls

Toán Lớp 6: (3x-14)^3-14=2×5^2
Giúp em vs pls

Comments ( 2 )

  1. Giải đáp:
    $x=6$.
    Lời giải và giải thích chi tiết:
    $(3x-14)^3-14=2.5^2\\\Rightarrow (3x-14)^3-14=2.25\\\Rightarrow (3x-14)^3-14=50\\\Rightarrow (3x-14)^3=64\\\Rightarrow (3x-14)^3=4^3\\\Rightarrow 3x-14=4\\\Rightarrow 3x=18\\\Rightarrow x=6$

  2. ( 3x – 14 )^3 – 14 = 2 x 5^2
    => ( 3x – 14 )^3 – 14 = 2 x 25
    => ( 3x – 14 )^3 – 14 = 50
    => ( 3x – 14 )^3 = 50 + 14
    => ( 3x – 14 )^3 = 64
    => ( 3x – 14 )^3 = 4^3
    => 3x – 14 = 4
    => 3x = 4 + 14
    => 3x = 18
    =>   x = 18 : 3
    =>   x = 6
                Vậy x = 6

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