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4(x2+xy+xy+y2)+5x+=5y+1
=4(x2+xy+xy+y2)+4x+4y+x+y+1
=4(x2+xy+xy+y2+x+y)+(x+y+1)
=4(x+y)(x+y+1)+(x+y+1)
=(x+y+1)(4x+4y+1)
Hok tốt
\(4\left(x^2+2xy+y^2\right)+5x+5y+1\)
\(\Rightarrow4\left(x+y\right)^2+5\left(x+y\right)+1\)
\(\Rightarrow\left(x+y\right)\left[4\left(x+y\right)+5+1\right]\)
\(\Rightarrow\left(x+y\right)\left(4\left(x+y\right)+6\right)\)
\(\Rightarrow2\left(x+y\right)\left(2\left(x+y\right)+3\right)\)
a) \(x^2-x-y^2-y\)
\(=\left(x^2-y^2\right)-\left(x+y\right)\)
\(=\left(x-y\right)\left(x+y\right)-\left(x+y\right)\)
\(=\left(x-y-1\right)\left(x+y\right)\)
b) \(x^2-2xy+y^2-z^2\)
\(=\left(x-y\right)^2-z^2\)
\(=\left(x-y-z\right)\left(x-y+z\right)\)
c) \(5x-5y+ax-ay\)
\(=5\left(x-y\right)+a\left(x-y\right)\)
\(=\left(5+a\right)\left(x-y\right)\)
\(ax+bx+ay+by\)
\(=x\left(a+b\right)+y\left(a+b\right)\)
\(=\left(x+y\right)\left(a+b\right)\)
\(xy+1-x-y\)
\(=x\left(y-1\right)-\left(y-1\right)\)
\(=\left(x-1\right)\left(y-1\right)\)
a) 2xy2 - 6x2y + 4xy
= 2xy.(y - 3x + 2)
b) x2 - y2 - 5x + 5y
= (x+y).(x-y) - 5.(x-y)
= (x-y).(x+y-5)
c) x2 - 4y2 - 1 + 4y
= x2 - (4y2 - 4y + 1)
= x2 - [ (2y)2 - 2.2.y.1 + 12 ]
= x2 - (2y-1)2
= (x+2y-1).(x-2y+1)
\(x^2-y^2-5x+5y=\left(x^2-y^2\right)-\left(5x-5y\right)\)
\(=\left(x+y\right)\left(x-y\right)-5\cdot\left(x-y\right)\)
\(=\left(x-y\right)\cdot\left[\left(x+y\right)-5\right]=\left(x-y\right)\cdot\left(x+y-5\right)\)
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)
a) \(x^2-x-y^2+y\)
\(=x\left(x-1\right)-y\left(y-1\right)\)
\(=\left(x-1\right)\left(x-y\right)\)
b) \(x^2-2xy-z^2+y^2\)
\(=\left(x^2-2xy+y^2\right)-z^2\)
\(=\left(x-y\right)^2-z^2\)
\(=\left(x-y-z\right)\left(x-y+z\right)\)
c) \(5x-5y+ax-ay\)
\(=5\left(x-y\right)+a\left(x-y\right)\)
\(=\left(x-y\right)\left(5+a\right)\)
\(5x^2+3\left(x+y\right)^2-5y^2\)
\(=5x^2-5y^2+3\left(x+y\right)^2\)
\(=5\left(x^2-y^2\right)+3\left(x+y\right)^2\)
\(=5\left(x+y\right)\left(x-y\right)+3\left(x+y\right)^2\)
\(=\left(x+y\right)\left[5\left(x-y\right)+3\left(x+y\right)\right]\)
\(=\left(x+y\right)\left[5x-5y+3x+3y\right]\)
\(=\left(x+y\right)\left(8x-2y\right)\)
\(=2\left(x+y\right)\left(4x-y\right)\)
\(-x^2+5x+2xy-5y-y^2\)
\(=-x^2+2xy-y^2+5x-5y\)
\(=-\left(x^2-2xy+y^2\right)+\left(5x-5y\right)\)
\(=-\left(x-y\right)^2+5\left(x-y\right)\)
\(=\left(x-y\right).\left[-\left(x-y\right)+5\right]\)
\(=\left(x-y\right).\left(y-x+5\right)\)