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

Toán Lớp 6: Giúp mik với ????² =2³ + 3² + 4³

Toán Lớp 6: Giúp mik với
????² =2³ + 3² + 4³

Comments ( 2 )

  1. x^2 = 2^3 + 3^2 + 4^3
    x^2 = 8 + 9 + 64
    x^2 = 81
    ⇒ x^2 ∈ {9^2; (-9)^2}
    ⇒ x ∈ {9; -9}
     

  2. x^2=2^3+3^2+4^3
    x^2=8+9+64
    x^2=81
    x^2=9^2
    =>x={-9;9}

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

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