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

Toán Lớp 6: (2.x+1)^3=125 Chú ý mình chưa học số âm

Toán Lớp 6: (2.x+1)^3=125
Chú ý mình chưa học số âm

Comments ( 2 )

  1. Answer
    (2x + 1)^{3} = 125
    $\Rightarrow$ (2x + 1)^{3} = 5^{3}
    $\Rightarrow$ 2x + 1 = 5
    $\Rightarrow$ 2x = 5 – 1
    $\Rightarrow$ 2x = 4
    $\Rightarrow$ x = 4 : 2
    $\Rightarrow$ x=  2
    $\text{Vậy}$ x=  2

  2. (2x+1)³ = 125
    ⇔ (2x+1)³ = 5³
    ⇔ 2x+1=5
    ⇔ 2x = 4
    ⇔ x = 2

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