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`a^3-a^2 x -ay+xy`
`=a^2(a-x)-y(a-x)`
`=(a-x)(x^2-y)`
`x^2-2xy+x-2y`
`= (x^2+x)-(2xy+2y)`
`=x(x+1)-2y(x+1)`
`=(x+1)(x-2y)`
`x^2-2x+2y-xy`
`=x(x-2) + y(2-x)`
`=x(x-2)-y(x-2)`
`=(x-2)(x-y)`
a) y2 - x2 - 6x - 9 = y2 - (x2 + 6x + 9) = y2 - (x + 3)2 = (y - x - 3)(x + y + 3)
b) x2 - y2 - 2y - 1 = x2 - (y2 + 2y + 1) = x2 - (y + 1)2 = (x - y - 1)(x + y + 1)
c) 3x2(xy - 2y) - 15(xy - 2y) = 3y(x - 2)(x2 - 5)
\(1,=x\left(x^2-2x+1-y^2\right)=x\left[\left(x-1\right)^2-y^2\right]=x\left(x-y-1\right)\left(x+y-1\right)\\ 2,=\left(x+y\right)^3\\ 3,=\left(2y-z\right)\left(4x+7y\right)\\ 4,=\left(x+2\right)^2\\ 5,Sửa:x\left(x-2\right)-x+2=0\\ \Leftrightarrow\left(x-2\right)\left(x-1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)
a.
\(=xy\left(x+xy-y\right)\)
b.
\(3xy-6y+x^2-2x=3y\left(x-2\right)+x\left(x-2\right)\)
\(=\left(3y+x\right)\left(x-2\right)\)
c.
\(x^2-12x+36-64y^2=\left(x-6\right)^2-\left(8y\right)^2\)
\(=\left(x-6+8y\right)\left(x-6-8y\right)\)
d.
\(x^2+7x+10=x^2+2x+5x+10=x\left(x+2\right)+5\left(x+2\right)\)
\(=\left(x+2\right)\left(x+5\right)\)
`@` `\text {Ans}`
`\downarrow`
`x^2 + xy - 2x - 2y`
`= (x^2 - 2x) + (xy - 2y)`
`= x(x - 2) + y(x - 2)`
`= (x + y)(x - 2)`
____
`x^2 - xy - 6x + 6y`
`= (x^2 - 6x) - (xy - 6y)`
`= x(x - 6) - y(x - 6)`
`= (x - y)(x - 6)`
____
`5xy^2 - 5x + y^2 - 1`
`= (5xy^2 + y^2) - (5x + 1)`
`= y^2(5x + 1) - (5x + 1)`
`= (y^2 - 1)(5x + 1)`
`= (y - 1)(y + 1)(5x + 1)`
a: =(x^2+xy)-(2x+2y)
=x(x+y)-2(x+y)
=(x+y)(x-2)
b: =(x^2-xy)-(6x-6y)
=x(x-y)-6(x-y)
=(x-y)(x-6)
c: =5xy^2+y^2-5x-1
=y^2(5x+1)-(5x+1)
=(5x+1)(y^2-1)
=(5x+1)(y+1)(y-1)
bài 1: ĐKXĐ: \(x\notin\left\{2;-2\right\}\)
\(\dfrac{x}{x+2}-\dfrac{x}{x-2}\)
\(=\dfrac{x\left(x-2\right)-x\left(x+2\right)}{\left(x-2\right)\left(x+2\right)}\)
\(=\dfrac{x^2-2x-x^2-2x}{\left(x-2\right)\left(x+2\right)}=-\dfrac{4x}{x^2-4}\)
Bài 2:
1: \(x^2y^2-8-1\)
\(=x^2y^2-9\)
\(=\left(xy-3\right)\left(xy+3\right)\)
2: \(x^3y-2x^2y+xy-xy^3\)
\(=xy\cdot x^2-xy\cdot2x+xy\cdot1-xy\cdot y^2\)
\(=xy\left(x^2-2x+1-y^2\right)\)
\(=xy\left[\left(x-1\right)^2-y^2\right]\)
\(=xy\left(x-1-y\right)\left(x-1+y\right)\)
3: \(x^3-2x^2y+xy^2\)
\(=x\cdot x^2-x\cdot2xy+x\cdot y^2\)
\(=x\left(x^2-2xy+y^2\right)=x\left(x-y\right)^2\)
4: \(x^2+2x-y^2+1\)
\(=\left(x^2+2x+1\right)-y^2\)
\(=\left(x+1\right)^2-y^2\)
\(=\left(x+1+y\right)\left(x+1-y\right)\)
5: \(x^2+2x-4y^2+1\)
\(=\left(x^2+2x+1\right)-4y^2\)
\(=\left(x+1\right)^2-4y^2\)
\(=\left(x+1-2y\right)\left(x+1+2y\right)\)
6: \(x^2-6x-y^2+9\)
\(=\left(x^2-6x+9\right)-y^2\)
\(=\left(x-3\right)^2-y^2=\left(x-3-y\right)\left(x-3+y\right)\)
\(x^2+xy-2y^2\)
\(=x^2+2xy-xy-2y^2\)
\(=x\left(x+2y\right)-y\left(x+2y\right)\)
\(=\left(x-y\right)\left(x+2y\right)\)
\(x^2+xy-2y^2\)
\(=x(x+y)-2y\)