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

Toán Lớp 8: (x-3)^3-(x-3)(x^2+3x+9)+9(x+1)^2=15

Toán Lớp 8: (x-3)^3-(x-3)(x^2+3x+9)+9(x+1)^2=15

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    (x-3)^3-(x-3)(x^2+3x+9)+9(x+1)^2=15
    <=> x^3-9x^2+27x-27-x^3+27+9x^2+18x+9=15
    <=> (x^3-x^3)+(9x^2-9x^2)+(27x+18x) + (27-27+9) = 15
    <=> 45x + 9 =15
    <=> 45x = 6
    <=> x = 2/15
    Vậy S = {2/15}

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