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

Toán Lớp 8: phan tich da thuc thanh nhan tu bang cach phoi hop nhieu phuong phap a, xy^2-4xz^2-2xy+x

Toán Lớp 8: phan tich da thuc thanh nhan tu bang cach phoi hop nhieu phuong phap
a, xy^2-4xz^2-2xy+x

Comments ( 2 )

  1. \qquad xy^2-4xz^2-2xy+x
    =x(y^2-4z^2-2y+1)
    =x[(y^2-2y+1)-4z^2]
    =x[(y-1)^2-(2z)^2]
    =x(y-2z-1)(y+2z-1)

  2. xy^2-4xz^2-2xy+x
    = x(y^2-4z^2-2y+1)
    = x(y^2-2y+1-4z^2)
    = x[(y^2-2y*1+1^2)-4z^2]
    = x[(y-1)^2-4z^2]
    = x(y-1-2z)(y-1+2z)
    Hằng đẳng thức :
    a^2 – 2ab + b^2 = (a-b)^2

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

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