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

Toán Lớp 8: Tìm x ( x – 2 )^3 – ( x – 3 ) . ( x^2 + 3x + 9 ) + 6 . ( x + 1 )^2 = 15

Toán Lớp 8: Tìm x
( x – 2 )^3 – ( x – 3 ) . ( x^2 + 3x + 9 ) + 6 . ( x + 1 )^2 = 15

Comments ( 2 )

  1. $(=) x^3 – 6x^2 + 12x – 8 – x^3 + 27 + 6x^2 + 12x + 6 = 15$
    $(=) 24x+25=15$
    $(=) 24x=15-25$
    $(=) 24x=-10$
    $=) x=-5/12$

  2. Giải đáp:
    S={-5/(12)}
    Lời giải và giải thích chi tiết:
    (x-2)^3-(x-3)(x^2+3x+9)+6(x+1)^2=15
    ⇔x^3-6x^2+12x-8-x^3+27+6(x^2+2x+1)=15
    ⇔-6x^2+12x+6x^2+12x+6=15-27+8
    ⇔24x+6=-4
    ⇔24x=-10
    ⇔x=-5/(12)
    Vậy S={-5/(12)}
     

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