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

Toán Lớp 8: x^3+4x^2+x x^2+7x-8 7x-6x^2-2 x^2+6x+5 helpppppppppp

Toán Lớp 8: x^3+4x^2+x
x^2+7x-8
7x-6x^2-2
x^2+6x+5
helpppppppppp

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết !
    a)
    x^3+4x^2+x
    = x(x^2+4x+1)
    b)
    x^2+7x-8
    = x^2-8x+x-8
    = (x^2-8x)+(x-8)
    = x(x-8)+(x-8)
    = (x+1)(x-8)
    c)
    7x-6x^2-2
    = -6x^2+7x-2
    = -(6x^2-7x+2)
    = -(6x^2-4x-3x+2)
    = -[(6x^2-4x)-(3x-2)]
    = -[2x(3x-2)-(3x-2)]
    = -(2x-1)(3x-2)
    d)
    x^2+6x+5
    = x^2+5x+x+5
    = (x^2+5x)+(x+5)
    = x(x+5)+(x+5)
    = (x+1)(x+5)
     

  2. x³+4x²+x = x(x²+4x+1)
    x²+7x-8 = x²-8x+x-8
                   =x(x-8)+1(x-8)
                   =(x+1)(x-8)
    7x-6x²-2 =-6x²+7x-2
                    =-6x²+4x+3x-2
                    =-2x(3x-2)+(3x-2)
                    =(3x-2)(-2x+1)
    x²+6x+5 =  x² +x+ 5x+5
                    =x(x+1)+5(x+1)
                    =(x+5)(x+1)
    #CHÚC BẠN HỌC TỐT!
     

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

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