Question

x²-x+y²-ý   giúp mình vs mọi người ơi help me !!!!!

Answer 1

\(=\left(x-x\right)^2+\left(y-y\right)^2=0^2+0^2=1+1=2\)

Answer 2

\(x^2-x-y^2-y\)

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

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

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

Answer 3

đề bài là gì thế bn???
 

Answer 4

x² - x + y² - y = x . x - x + y . y - y

= 2x + 2y

= 2(x + y)