Question

phân tích các đa thức sau thành nhân tử: \(x^2-x-y^2-y\)

Answer 1

\(x^2-x-y^2-y=\left(x^2-y^2\right)-\left(x+y\right)\)

\(=\left(x-y\right)\left(x+y\right)-\left(x+y\right)=\left(x-y-1\right)\left(x+y\right)\)

Answer 2

Ta có\(\left(x^2-y^2\right)-\left(x+y\right)=\left(x-y\right)\left(x+y\right)-\left(x+y\right)=\left(x+y\right)\left(x-y-1\right)\)

Answer 3

\(x^2-x-y^2-y=\left(x^2-y^2\right)-\left(x+y\right)\\ =\left(x-y\right)\left(x+y\right)-\left(x+y\right)=\left(x+y\right)\left(x-y-1\right)\)

tick mình vs nha :v