phân tích đa thức thành nhân tử a.5x^2-5xy-10x+10y b.4x^2+8xy-3x-6y c.2x+2y-x(x+y) d.x(x-y)+(x-y)

$a)_{}$ $5x^2-5xy-10x+10y_{}$

$⇔x.(x^2-xy-2x+2y)_{}$

$⇔5. [ x.(x-y)-2.(x-y)]_{}$

$⇔5.(x-y)(x-2)_{}$

$b)_{}$ $4x^2+8xy-3x-6y_{}$

$⇔4x.(x+2y)-3.(x+2y)_{}$

$⇔(x+2y)(4x-3)_{}$

$c)_{}$ $2x+2y-x.(x+y)_{}$

$⇔2.(x+y)-x.(x+y)_{}$

$⇔(x+y)(2-x)_{}$

$d)_{}$ $x.(x-y)+(x-y)_{}$

$⇔(x+1)(x-y)_{}$