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

Toán Lớp 8: x (4 – x) + x (2+3x) = 18 – 4x (x + 5) x^2 = 81 (x+5)

Toán Lớp 8: x (4 – x) + x (2+3x) = 18 – 4x
(x + 5) x^2 = 81 (x+5)

Comments ( 1 )

  1. Giải đáp:
    1. x (4 – x) + x (2+3x) = 18 – 4x
        4x-x^2+2x+3x^2  =18-4x
        6x+2x^2                =18-4x
        2x^2+10x              =0
        x=-5  hoặc x=0
    2. (x + 5) x^2              = 81 (x+5)
        x^3+5x^2              =81x+405
        x^3+5x^2-81x-405=0
        x=9   hoặc x=-5   hoặc x=-9
     

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