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\(=\left(x-y\right)\left(x+y\right)-5\left(x-y\right)=\left(x-y\right)\left(x+y-5\right)\)
\(=\left(x-y\right)\left(x+y\right)-5\left(x-y\right)=\left(x+y-5\right)\left(x-y\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5x^2+3\left(x+y\right)-5y^2=5\left(x+y\right)\left(x-y\right)+3\left(x+y\right)=\left(x+y\right)\left[5\left(x-y\right)+3\right]\)
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Câu 1 đề sai rồi bạn ơi
Câu 2/ 5(x2 + 2xy + y2 ) = 5(x +y )2
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\(x^2-y^2-5x+5y=\left(x^2-y^2\right)-\left(5x-5y\right)\)
\(=\left(x+y\right)\left(x-y\right)-5\cdot\left(x-y\right)\)
\(=\left(x-y\right)\cdot\left[\left(x+y\right)-5\right]=\left(x-y\right)\cdot\left(x+y-5\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x2 - 5x + 5y - y2 =
= -5 (x-y) + (x2 - y2 )
= -5 (x-y) + (x-y)(x+y)
= (x-y) (-5 +x+y)
x2-5x+5y-y2
=x2-y2-5x+5y
=(x2-y2)-5(x+y)
=(x2-y2)(-5+x+y)
\(=\left(x-y\right)\left(x+y\right)+5\left(x-y\right)\)
\(=\left(x+y+5\right)\left(x-y\right)\)
Học tốt
Ta có : x2 - y2 - 5x - 5y
= ( x2 - y2 ) - ( 5x + 5y )
= ( x - y )( x + y ) - 5( x + y )
= ( x + y )( x - y - 5 )