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

Toán Lớp 6: 2.x mũ 3 – 4 = 12 5 . x mũ 3 – 5 = 0 mũ 2 = 16 mũ 3 =27

Toán Lớp 6: 2.x mũ 3 – 4 = 12
5 . x mũ 3 – 5 = 0
mũ 2 = 16
mũ 3 =27

Comments ( 2 )

  1. Lời giải:
    1)
    2.x^(3)-4=12
    ⇒2.x^(3)=12+4
    ⇒2.x^(3)=16
    ⇒x^3=8
    ⇒x=2
    Vậy x=2
    2)
    5.x^(3)-5=0
    ⇒5.x^(3)=5
    ⇒x^3=1
    ⇒x=1
    Vậy x=1
    3)
    (x+1)^2=16
    ⇒(x+1)^2=(±4)^2
    $⇒\left[\begin{matrix}x+1=4\\ x+1=-4\end{matrix}\right.$
    $⇒\left[\begin{matrix}x=3\\ x=-5\end{matrix}\right.$
    Vậy x=3 hoặc x=-5
    4)
    (x+1)^3=27
    ⇒(x+1)^3=3^3
    ⇒x+1=3
    ⇒x=3-1
    ⇒x=2
    Vậy x=2

  2. a)2.x^3-4=12
    2.x^3=12+4=16
    x^3=16:2=8
    x^3=2^3
    x=2
    b)5.x^3-5=0
    5.x^3=0+5=5
    x^3=5:5=1
    x^3=1^3
    x=1
    c)(x+1)^2=16
    (x+1)^2=(+-4)^2
    TH1:x+1=4->x=3
    TH2:x+1=-4->x=-5
    Vậy x=3;-5
    d)(x+1)^3=27
    (x+1)^23=3^3
    x+1=3
    x=3-1
    x=2
     

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