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\(=x^3-2x^2y+xy^2+5x^2y-10xy^2+5y^3\)
\(=x\left(x^2-2xy+y^2\right)+5y\left(x^2-2xy+y^2\right)\)
\(=\left(x+5y\right)\left(x-y\right)^2\)
x3 + 3x2y - 9xy2 + 5y3
= ( x3 - 3x2y + 3xy2 - y3 ) + ( 6y3 - 12xy2 + 6 x2y )
= ( x - y )3 + 6y ( x - y )2
= ( x - y )2 ( x + 5y )
`@` `\text {Ans}`
`\downarrow`
`x^2 - 8xy + 7y^2`
`= x^2 - xy - 7xy + 7y^2`
`= (x^2 - xy) - (7xy - 7y^2)`
`= x(x - y) - 7y(x - y)`
`= (x - 7y)(x - y)`
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`x^2 - 9xy + 14y^2`
`= x^2 - 2xy - 7xy + 14y^2`
`= (x^2 - 2xy) - (7xy - 14y^2)`
`= x(x - 2y) - 7y(x - 2y)`
`= (x - 7y)(x - 2y)`
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`x^2 - 11xy + 18y^2`
`= x^2 - 2xy - 9xy + 18y^2`
`= (x^2 - 2xy) - (9xy - 18y^2)`
`= x(x - 2y) - 9y(x - 2y)`
`= (x - 9y)(x - 2y)`
a: =x^2-xy-7xy+7y^2
=x(x-y)-7y(x-y)
=(x-y)(x-7y)
b: =x^2-2xy-7xy+14y^2
=x(x-2y)-7y(x-2y)
=(x-2y)(x-7y)
c: =x^2-2xy-9xy+18y^2
=x(x-2y)-9y(x-2y)
=(x-2y)(x-9y)
a) \(x^3y^3+x^2y^2+4\)
\(=x^3y^3-x^2y^2+2x^2y^2-2xy+2xy+4\)
\(=\left(x^3y^3-x^2y^2+2xy\right)+\left(2x^2y^2-2xy+4\right)\)
\(=xy\left(x^2y^2-xy+2\right)+2\left(x^2y^2-xy+2\right)\)
\(=\left(xy+2\right)\left(x^2y^2-xy+2\right)\)
b) \(x^3+3x^2y-9xy^2+5y^3\)
\(=x^3+5x^2y-2x^2y-10xy^2+xy^2+5y^3\)
\(=\left(5y^3-10xy^2+5x^2y\right)+\left(xy^2-2x^2y+x^3\right)\)
\(=5y\left(y^2-2xy+x^2\right)+x\left(y^2-2xy+x^2\right)\)
\(=\left(5y+x\right)\left(y^2-2xy+x^2\right)\)
\(=\left(5y+x\right)\left(y-x\right)^2\)
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Ta có: \(x^3+3x^2y-9xy^2+5y^3\)
\(=x^3-y^3+6y^3-6xy^2-3xy^2+3x^2y\)
\(=\left(x-y\right)\left(x^2+xy+y^2\right)-6y^2\left(x-y\right)+3xy\left(x-y\right)\)
\(=\left(x-y\right)\left(x^2+xy+y^2-6y^2+3xy\right)\)
\(=\left(x-y\right)\left(x^2+4xy-5y^2\right)\)
\(=\left(x-y\right)\left(x^2-xy+5xy-5y^2\right)\)
\(=\left(x-y\right)\left[x\left(x-y\right)+5y\left(x-y\right)\right]\)
\(=\left(x-y\right)^2\left(x+5y\right)\)
Vậy \(x^3+3x^2y-9xy^2+5y^3=\left(x-y\right)^2\left(x+5y\right)\)
\(x^8y^8+x^4y^4+1=\left[\left(x^4y^4\right)^2+2x^4y^4+1\right]-x^4y^4=\left(x^4y^4+1\right)^2-\left(x^2y^2\right)^2\)
\(=\left(x^4y^4+1-x^2y^2\right)\left(x^4y^4+1+x^2y^2\right)\)
\(=\left(x^4y^4+1-x^2y^2\right)\left[\left(x^2y^2\right)^2+2x^2y^2+1-x^2y^2\right]\)
\(=\left(x^4y^4+1-x^2y^2\right)\left[\left(x^2y^2+1\right)^2-\left(xy\right)^2\right]\)
\(=\left(x^4y^4+1-x^2y^2\right)\left(x^2y^2+1-xy\right)\left(x^2y^2+1+xy\right)\)
Phân tích đa thức thành nhân tử
x3+3x2y−9xy2+5y2
x8y8+x4y4+1
11xy-5y+9xy+5y=0
20xy=0
xy=0
x=0;y=0