a) 5x\(^2\)+5xy -x -y
= ( 5x\(^2\) - x ) + ( 5xy - y )
= x ( 5x - 1 ) + y ( 5x - 1 )
= ( x + y ) ( 5x - 1 )
b)x^2- 2xy +y^2-z câu này là z\(^2\) hay gì hả bạn
a,\(5x^2+5xy-x-y\)
\(\Leftrightarrow5x\left(x+y\right)-\left(x-y\right)\)
\(\Leftrightarrow\left(x+y\right)\left(5x-1\right)\)