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

Toán Lớp 8: 2(x-1)^2+3(x-2)^2=5(x+2)(x+1)+4 tim x minh dang can gap

Toán Lớp 8: 2(x-1)^2+3(x-2)^2=5(x+2)(x+1)+4
tim x minh dang can gap

Comments ( 2 )

  1. 2(x-1)^2 + 3(x-2)^2 = 5(x+2)(x+1)+4
    2(x^2 – 2x +1) + 3(x^2 – 4x +4) = 5( x^2 + 3x +2)+4
    2x^2 – 4x + 2 + 3x^2 – 12x + 12 = 5x^2 + 3x + 10 +4
    2x^2 – 4x + 3x^2 – 12x – 5x^2 – 3x =10+4-2-12
    (2x^2 + 3x^2 – 5x^2 ) + (-4x -12x -3x) = 0
    -19x=0
    => x =0
     

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