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

Toán Lớp 8: 2. Ph©n tÝch ®a thøc thµnh nh©n tö. 1) 12x2y – 3xy2 + 9xy 2) 3x(x – 1) + (x – 1) 3) 3x(x – 2y) + 6y(2y – x) 4) x 2 – 4x 5) x2 – 4y2 + x

Toán Lớp 8: 2. Ph©n tÝch ®a thøc thµnh nh©n tö.
1) 12x2y – 3xy2 + 9xy
2) 3x(x – 1) + (x – 1)
3) 3x(x – 2y) + 6y(2y – x)
4) x
2
– 4x
5) x2
– 4y2 + x + 2y

Comments ( 2 )

  1. 1)12x^2y-3xy^2+9xy
    =3xy(4x-y+3)
    2)3x(x-1)+(x-1)
    =(x-1)(3x+1)
    3)3x(x-2y)+6y(2y-x)
    =3x(x-2y)-6y(x-2y)
    =(x-2y)(3x-6y)
    4)x^2-4x
    =x(x-4)
    5)x^2-4y^2+x+2y
    =x^2-(2y)^2+(x+2y)
    =(x-2y)(x+2y)
    =(x+2y)(x-2y+1)

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    1)12x^{2}y – 3xy^2 + 9xy
    =3xy.(4x – y + 3) (Sử dụng phương pháp tìm nhân tử chung )
    2)3x . ( x – 1 ) + ( x – 1 )
    =( x – 1 ) . ( 3x + 1 ) (Nhóm hạng tử)
    3) x^2 – 4x
    =x . ( x – 4)(Tìm nhân tử chung)
    4) x^2 – 4y^2 + x + 2y
    =x^2 – (2y)^2 + x + 2y
    =( x^2 – (2y)^2) + (x + 2y)
    = (x – 2y)(x+2y) + (x+2y)
    = ( x + 2y ) . ( x – 2y + 1 )

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