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

Toán Lớp 8: (x + 1)^2 + ( x − 2 )(x + 3 ) − 4x

Toán Lớp 8: (x + 1)^2 + ( x − 2 )(x + 3 ) − 4x

Comments ( 2 )

  1. (x+1)^2+(x-2)(x+3)-4x
    =x^2+2x+1+x^2+3x-2x-6-4x
    =(x^2+x^2)+(2x+3x-2x-4x)+(1-6)
    =2x^2-x-5
    * (a+b)^2=a^2+2ab+b^2
    * Nhân đa thức với đa thức
     

  2. (x+1)^2 + (x-2)(x+3) – 4x
    = x^2 + 2x + 1 + x^2 + 3x – 2x – 6 – 4x
    = ( x^2 + x^2 ) + ( 2x + 3x – 2x – 4x) + ( 1-6)
    = 2x^2 -x -5

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

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