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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. $\text{(x+1)²+(x-2)(x+3)-4x}$
    $\text{=x²+2x+1+x²+3x-2x-6-4x}$
    $\text{=2x²-x-5}$
     

  2. #huy
    (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 = ? ( )