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

Toán Lớp 8: a, 6x^2-(2x+5)(3x-2)=-12 b,x^2+x=0 c,x^3-5x=0 Giúp mk vs ạ

Tháng Chín 6, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a, 6x^2-(2x+5)(3x-2)=-12
b,x^2+x=0
c,x^3-5x=0
Giúp mk vs ạ

Comments ( 2 )

  1. dongoctuan
    dongoctuan
    6 Tháng Chín, 2022 at 9:31 chiều
    Reply
    Gửi bạn:

    toan-lop-8-a-6-2-2-5-3-2-12-b-2-0-c-3-5-0-giup-mk-vs-a

  2. ngoclandiep
    ngoclandiep
    6 Tháng Chín, 2022 at 9:31 chiều
    Reply
    $\displaystyle \begin{array}{{>{\displaystyle}l}} 6x^{2} -( 2x+5)( 3x-2) =-12\ \\ 6x^{2} -\left( 6x^{2} -4x+15x-10\right) +12=0\ \\ 6x^{2} -6x^{2} +4x-15x+10+12=0\ \\ -11x+22=0\ \\ \rightarrow x=2\ \\ Vậy…\ \\ b) x^{2} +x=0\ \\ x( x+1) =0\ \\ \rightarrow \begin{cases} x=0 & \\ x+1=0 & \end{cases}\rightarrow \begin{cases} x=0 & \\ x=-1\ & \end{cases} \ \\ Vậy…\ \\ c) x^{3} -5x=0\ \\ x\left( x^{2} -5\right) =0\ \\ x\left( x-\sqrt{5}\right)\left( x+\sqrt{5}\right) =0\ \\ \rightarrow \begin{cases} x=0 & \\ x-\sqrt{5} =0 & \\ x+\sqrt{5} =0 & \end{cases}\rightarrow \begin{cases} x=0 & \\ x=\sqrt{5} & \\ x=-\sqrt{5} & \ \end{cases}\\ Vậy…. \end{array}$
     

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

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