( x – 1/2 ) = 0 , (x -2) mủ 2 = 1 , (2x – 1) mủ 3 = -8

0 bình luận về “( x – 1/2 ) = 0 , (x -2) mủ 2 = 1 , (2x – 1) mủ 3 = -8”

1. `1,  x – 1/2 = 0`

   `⇒ x = 0 + 1/2`

   `⇒ x = 1/2`

   Vậy `x = 1/2`

   `2, (x – 2)^2 = 1`

   Xét 2 trường hợp:

   +) TH1: ` x – 2 = 1`

   `⇒ x = 1 + 2`

   `⇒ x = 3`

   +) TH2: `x – 2 = -1`

   `⇒ x = -1 + 2`

   `⇒ x =  1`

   Vậy `x ∈ {3 ; 1}`

   `3, (2x – 1)^3 = -8`

   `⇒ 2x – 1 = -2`

   `⇒ 2x = -2 + 1`

   `⇒ 2x = -1`

   `⇒  x = (-1) : 2`

   `⇒  x =  (-1)/2`

   Vậy `x = (-1)/2`

    

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2. $(x-$$\frac{1}{2}$$)=0$

   $x=0+$$\frac{1}{2}$

   $x=$$\frac{1}{2}$

   $(x-2)^2=1$

   $\text{TH1:}$ $x-2=1$

   $x-2=1$

   $x=1+2$

   $x=3$

   $\text{TH2:}$ $x-2=-1$

   $x=-1+2$

   $x=1$

   $\text{Vậy}$ $x=1$ $\text{hoặc}$ $x=3$

   $(2x-1)^3=-8$

   $(2x-1)^3=(-2)^3$

   $2x-1=-2$

   $2x=-2+1$

   $2x=-1$

   $x=$$\frac{-1}{2}$

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