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

Toán Lớp 8: 1. x^2+x-6 2.-y^2+5x+6 3. 3x^3+12x^2+12x

Toán Lớp 8: 1. x^2+x-6
2.-y^2+5x+6
3. 3x^3+12x^2+12x

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     1) x^2 + x – 6
    = x^2 + 3x – 2x – 6
    = x(x+3) – 2(x+3)
    = (x-2)(x+3)
    2) -y^2+5x+6 = -(y^2 – 5x – 6)
    3) 3x^3 + 12x^2 + 12x
    = 3(x^3+4x^2 + 4x)
    = 3x(x^2 + 4x + 4)
    = 3x(x^2 + 2x + 2x + 4)
    = 3x[x(x+2)+2(x+2)]
    = 3x(x+2)(x+2)
    = 3x(x+2)^2

  2. 1) x^2 + x – 6
    = x^2 + 3x – 2x – 6
    = ( x^2 + 3x ) – ( 2x + 6 )
    = x ( x + 3 ) – 2 ( x + 3 )
    = ( x + 3 ) ( x – 2 )
    2) -y^2 + 5x + 6
    = – ( y^2 – 5x – 6 )  
    3) 3x^3 + 12x^2 + 12x
    = 3x ( x^2 + 4x + 4 )
    = 3x ( x + 2 )^2  
     
     

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