phân tích các đa thức sau thành nhân tử:xy^2+x^2y+1/4y^3 x^2+2x-y^2+1 x^2+xy+x-y

`xy^2 + x^2y + 1/4y^3`

`= y ( x^2 + xy + 1/4y^2 )`

`= y [ x^2 + 2 . x . 1/2y + ( 1/2y )^2 ]`

`= y ( x + 1/2y )^2`

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`x^2 + 2x - y^2 + 1`

`= ( x + 1 )^2 - y^2`

`= ( x + 1 + y ) ( x + 1 - y )`

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Sửa `:` `x^2 - xy + x - y`

`= x ( x + 1 ) - y ( x + 1 )`

`= ( x + 1 ) ( x - y )`