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

Toán Lớp 8: (5????−2)(????+1)−3????(????2−????−3)−2????(????−5)(????−4)

Toán Lớp 8: (5????−2)(????+1)−3????(????2−????−3)−2????(????−5)(????−4)

Comments ( 2 )

  1. Giải đáp:
     Chắc đề là rút gọn .
    Lời giải và giải thích chi tiết:
    (5x-2)(x+1)-3x(x^2-x-3)-2x(x-5)(x-4) 
    = 5x^2 + 3x – 2 – 3x^3 + 3x^2 + 9x – 2x^3 + 18x^2 – 40x
    = (-3x^2-2x^3) + (5x^2+3x^2+18x^2) + (3x+9x-40x) – 2
    = -5x^3 + 26x^2 – 28x – 2

  2. (5x-2)(x+1)-3x(x^2-x-3)-2x(x-5)(x-4)
    =(5x^2+3x-2)-(3x^3-3x^2-9x)-(2x^3-18x^2+40x)
    =5x^2+3x-2-3x^3+3x^2+9x-2x^3+18x^2-40x
    =(-3x^3-2x^3)+(5x^2+3x^2+18x^2)+(3x+9x-40x)-2
    =-5x^3+26x^2-28x-2
     

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

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