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

Toán Lớp 8: 2)(x−2)^3-(3+x^2)(3-x) Rút gọn biểu thức

Toán Lớp 8: 2)(x−2)^3-(3+x^2)(3-x)
Rút gọn biểu thức

Comments ( 2 )

  1. (x-2)^3 – (3+x^2)(3-x)
    =x^3 – 6x^2 +12x – 8 – ( -x^3 +3x^2 -3x + 9)
    =x^3 – 6x^2 + 12x – 8 + x^3 – 3x^2 + 3x -9
    =2x^3 -9x^2 +15 x -17
    XIN 5 SAO VS HAY NHẤT AK
     

  2. $#Dứa$
    (x − 2)³ – (3 + x²)(3 – x)
    ⇔ x³ – 6x² + 12x – 8 – (-x³ + 3x² – 3x + 9)
    ⇔ x³ – 6x² + 12x – 8 + x³ – 3x² + 3x – 9
    ⇔ 2x³ – 9x² + 15x – 17
     

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