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

Toán Lớp 6: x(x-1)= (x-1)^2=1 x ^3.x^2=2^8 :2^3

Tháng Năm 9, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: x(x-1)=
(x-1)^2=1
x ^3.x^2=2^8 :2^3

Comments ( 2 )

  1. ankim
    ankim
    9 Tháng Năm, 2022 at 11:22 sáng
    Reply
    ${@Hyun-woo}$
    1.
    $x{(x-1)}$
    ${x2−x}$
    2.
    ${(x-1)^2=1}$
    ${x^ 2 −2x+1=1}$
    ${x^ 2 −2x+1−1=0}$
    ${x^ 2 −2x=0}$
    ${x(x−2)=0}$
    ${x=0}$
    $x={2}$
    3.
    ${x^3.x^2=2^8:2^3}$
    $x^{3+2}=2$$^{8-3}$
    $x^{5}=$ $2^{5}$
    $x={2}$
    Vậy $x=2$

  2. dongoclandiem
    dongoclandiem
    9 Tháng Năm, 2022 at 11:22 sáng
    Reply
    x( x – 1 ) = $x^2$ – x
    $\text{ _____________________ }$
    $( x – 1 )^2$ = 1
    $\Rightarrow$ $\left[\begin{matrix} x – 1 = 1\\ x – 1 = -1\end{matrix}\right.$                $\Rightarrow$ $\left[\begin{matrix} x = 1 + 1\\ x = -1 + 1\end{matrix}\right.$            $\Rightarrow$ $\left[\begin{matrix} x = 2\\ x = 0\end{matrix}\right.$ 
                                  $\text{ Vậy x ∈ { 0 ; 2 } }$
    $\text{ ________________________________________________________________ }$
    $x^3$. $x^2$ = $2^8$ : $2^3$
    $\Rightarrow$ $x^{3+2}$ = $2^{8-3}$
    $\Rightarrow$ $x^5$ = $2^5$
    $\Rightarrow$ x = 2
         $\text{ Vậy x = 2 }$
     

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

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