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

Toán Lớp 7: (x – $\frac{1}{2}$)$^{3}$ = $\frac{-1}{27}$

Toán Lớp 7: (x – $\frac{1}{2}$)$^{3}$ = $\frac{-1}{27}$

Comments ( 2 )

  1. Giải đáp:
    (x-1/2)^3 = -1/27
    => (x-1/2)^3 = (-1/3)^3
    => x-1/2 = -1/3
    => x = 1/6
    Vậy x = 1/6

  2. $(x-\dfrac{1}{2})$$^{3}=$ $\dfrac{-1}{27}$
    →$(x-\dfrac{1}{2})$$^{3}=($ $\dfrac{-1}{3})$$^{3}$ 
    →$x-\dfrac{1}{2}=$$\dfrac{-1}{3}$ \text{(vì 3 >0)}
    →$x=\dfrac{-1}{3}+$$\dfrac{1}{2}$
    →$x=\dfrac{(-2)+3}{6}$
    →$x=\dfrac{1}{6}$
    \text{#mct}

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