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

Toán Lớp 8: (x^2+2x+1)(-3x-(x^2-1)(-2) Tính

Toán Lớp 8: (x^2+2x+1)(-3x-(x^2-1)(-2)
Tính

Comments ( 2 )

  1. Giải đáp:
    = – 3x^3 – 4x^2 – 3x – 2 
    Lời giải và giải thích chi tiết:
    (x^2+2x+1)(-3x)-(x^2-1)(-2)
    = – 3x . x^2 – 3x . 2x – 3x .1 – [2.x^2 – 2.(-1)]
    = – 3x^3 – 6x^2 – 3x – (2x^2 + 2)
    = – 3x^3 – 6x^2 – 3x – 2x^2 – 2
    = – 3x^3 – (6x^2 + 2x^2) – 3x – 2
    = – 3x^3 – 4x^2 – 3x – 2
    #SunHee

  2. (x²+2x+1)(3x)(x²1)(2)
    = (-3x³-6x²-3x)-[-2x²+2]
    = -3x²-6x²-3x+2x²-4
    = (-3x²-6x²+2x²)-3x-4
    = -7x²-3x-4
     

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