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

Toán Lớp 8: x(x-2)(x+2)-(x-3)^3 giúp mình ạ

Toán Lớp 8: x(x-2)(x+2)-(x-3)^3
giúp mình ạ

Comments ( 2 )

  1. x(x-2)(x+2) – (x-3)^3
    = x(x^2-2^2)-(x^3 -9x^2 + 27x -27)
    = x(x^2 – 4) – x^3 + 9x^2 – 27x +27
    = x^3 – 4x – x^3 + 9x^2 – 27x +27
    = 9x^2 – 31x + 27

  2. Giải đáp+Lời giải và giải thích chi tiết:
    x(x-2)(x+2)-(x-3)^3
    =x(x^2-2^2)-(x^3-3.x^2 .3+3.x.3^2-3^3)
    =x(x^2-4)-(x^3-9x^2+27x-27)
    =x^3-4x-x^3+9x^2-27x+27
    =(x^3-x^3)+9x^2-(4x+27x)+27
    =9x^2-21x+27
    $\text{#LynhDay}$

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

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