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\(3x+3y-x^2-xy\)
\(=\left(3x+3y\right)-\left(x^2+xy\right)\)
\(=3\left(x+y\right)-x\left(x+y\right)\)
\(=\left(3-x\right)\left(x+y\right)\)
\(x\left(x-3\right)+y\left(x-3\right)\)
\(\left(x-3\right)\left(x+y\right)\)
k giúp mình nhé , mình k lại
^2 + 4xy - 16 + 4y^2
= x^2 + 4xy + 4y^2 - 4^2
= (x + 2y)^2 - 4^2
= (x + 2y - 4)(x + 2y + 4)
2x^2-5xy-3y^2
= 2^x + xy - 6xy - 3y^2
= x(2x + y) - 3y(2x + y)
= (2x + y)(x - 3y)
\(x^4y-3x^3y^2+3x^2y^3+xy^4=xy\left(x^3-3x^2y+3xy^2+y^3\right)\)
\(x^2+3x+3y+xy=x^2+xy+3x+3y=x.\left(x+y\right)+3.\left(x+y\right)\) \(=\left(x+3\right)\left(x+y\right)\)
\(x^2+5x^2+6x=x^2+x+5x^2+5x=x\left(x+1\right)+5x\left(x+1\right)\) \(=\left(x+5x\right)\left(x+1\right)=6x\left(x+1\right)\)
a)\(x^2+3x+3y+xy\)
\(=x\left(x+y\right)+3\left(x+y\right)\)
\(=\left(x+3\right)\left(x+y\right)\)
\(x^3y-xy^3-2xy^2-xy\)
\(=xy\left(x^2-y^2-2y-1\right)\)
\(=xy\left[x^2-\left(y^2+2y+1\right)\right]\)
\(=xy\left[x^2-\left(y+1\right)^2\right]\)
\(=xy\left(x-y-1\right)\left(x+y+1\right)\)
x2+3x+3y+xy
=x(x+3)+y(3+x)
=(x+3)(x+y)
x2 + 3x + 3y + xy
= ( x2 + xy) + ( 3x + 3y)
= x( x + y) + 3 ( x + y)
= ( x + y) ( x + 3)