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

Toán Lớp 8: (x-2)^3-(x-5)(x^2-5x+25)+6x^2=11

Toán Lớp 8: (x-2)^3-(x-5)(x^2-5x+25)+6x^2=11

Comments ( 2 )

  1. $(x-2)^3-(x+5)(x^2-5x+25)+6x^2=11$
    =>(x-2)^3-(x+5)(x^2-5x+5^2)+6x^2=11
    =>x^3-6x^2+12x-8-(x^3+5^3)+6x^2-11=0
    =>12x-144=0
    =>x=12
    #Wuang
     

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

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