\(-y^2+2xy-x^2+3x-3y\)

\(=-\left(x^2-2xy+y^2\right)+3\left(x-y\right)\)

\(=-\left(x-y\right)^2+3\left(x-y\right)\)

\(=\left(x-y\right)\left(-x+y+3\right)\)

cảm ơn nhiều

Ai trả lời mình đi cho đỡ quê 😞💔

a: \(=\left(x+2-y\right)\left(x+2+y\right)\)

c: \(=\left(x-y\right)^2\)

b: \(3x+3y-x^2-2xy-y^2\)

\(=3\left(x+y\right)-\left(x+y\right)^2\)

\(=\left(x+y\right)\left(3-x-y\right)\)

b) 3x+3y-x²-2xy-y²

=3(x+y)-(x+y)²

=(x+y)(3-x-y)

= (x-y)^2 + 3(x-y) - 4

= (x-y) (x-y+3-4)

= (x-y)(x-y-1)

\(x^2-2xy+y^2+3x-3y-10=\left(x^2-2xy+y^2\right)+3\left(x-y\right)-10=\left(x-y\right)^2+3\left(x-y\right)-10=\left(x-y\right)^2-2\left(x-y\right)+5\left(x-y\right)-10=\left(x-y\right)\left(x-y-2\right)+5\left(x-y-2\right)=\left(x-y+5\right)\left(x-y-2\right)\)

= ( x - y)^2  - 3 ( x - y) . -10

= ( x  - y)^2 - 2.(x-y) . 3/2 +9/4 - 49/4 

= ( x - y - 3/2) ^2 - (7/2)^2 

= ( x- y - 3/2 - 7/2 )( x - y -3/2 + 7/2 )

=( x - y - 5 )( x - y + 2)

1: =3(y^2+x^2+2xy-z^2)

=3(x+y-z)(x+y+z)

2: =2(8x^3+27y^3)

=2(2x+3y)(4x^2-6xy+9y^2)

3: =(x-y)^2-25

=(x-y-5)(x-y+5)

a) 10x + 15y = 5(2x + 3y)

b) x² - 2xy - 4 + y²

= (x² - 2xy + y²)  - 4

= (x - y)² - 2²

= (x - y + 2)(x - y - 2)

c) x(x + y) - 3x - 3y

= x(x + y) -3(x + y)

= (x - 3)(x + y)

a, \(10x+15y=5\left(2x+3y\right)\)

b, \(x^2-2xy-4+y^2=\left(x-y\right)^2-4=\left(x-y-2\right)\left(x-y+2\right)\)

c, \(x\left(x+y\right)-3x-3y=x\left(x+y\right)-3\left(x+y\right)=\left(x-3\right)\left(x+y\right)\)