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(2xy +1)2 - (2x + y)2
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\(=\left(2xy+1+2x+y\right)\left(2xy+1-2x-y\right)\)
\(=\left[2x\cdot\left(y+1\right)+y+1\right]\cdot\left[2x\cdot\left(y-1\right)-\left(y-1\right)\right]\)
\(=\left(2x+1\right)\cdot\left(y+1\right)\cdot\left(2x-1\right)\cdot\left(y-1\right)\)
\(=\left(4x^2-1\right)\cdot\left(y^2-1\right)\)
\(\left(2xy+1\right)^2-\left(2x+y\right)^2\)
\(=\left(2xy+1-2x-y\right)\left(2xy+1+2x+y\right)\)
\(=\left[2x\left(y-1\right)-\left(y-1\right)\right]\left[2x\left(y+1\right)+\left(y+1\right)\right]\)
\(=\left(y-1\right)\left(2x-1\right)\left(y+1\right)\left(2x+1\right)\)
a) \(3x^2-3xy-5x+5y\)
\(=\left(3x^2-3xy\right)-\left(5x-5y\right)\)
\(=3x\left(x-y\right)-5\left(x-y\right)\)
\(=\left(x-y\right)\left(3x-5\right)\)
b) \(2x^3y-2xy^3-4xy^2-2xy\)
\(=2xy\left(x^2-y^2-2y-1\right)\)
\(=2xy\left[x^2-\left(y^2+2y+1\right)\right]\)
\(=2xy\left[x^2-\left(y+1\right)^2\right]\)
\(=2xy\left(x-y-1\right)\left(x+y+1\right)\)
c) \(x^2+1+2x-y^2\)
\(=\left(x^2+2x+1\right)-y^2\)
\(=\left(x+1\right)^2-y^2\)
\(=\left(x+1+y\right)\left(x+1-y\right)\)
d) \(x^2+4x-2xy-4y+y^2\)
\(=\left(x^2-2xy+y^2\right)+\left(4x-4y\right)\)
\(=\left(x-y\right)^2+4\left(x-y\right)\)
\(=\left(x-y\right)\left(x-y+4\right)\)
e) \(x^3-2x^2+x\)
\(=x\left(x^2-2x+1\right)\)
\(=x\left(x-1\right)^2\)
f) \(2x^2+4x+2-2y^2\)
\(=2\left(x^2+2x+1-y^2\right)\)
\(=2\left[\left(x^2+2x+1\right)+y^2\right]\)
\(=2\left[\left(x+1\right)^2-y^2\right]\)
\(=2\left(x-y+1\right)\left(x+y+1\right)\)
a: =3x(x-y)-5(x-y)
=(x-y)(3x-5)
b: \(=2xy\left(x^2-y^2-2y-1\right)\)
\(=2xy\left[x^2-\left(y^2+2y+1\right)\right]\)
\(=2xy\left(x-y-1\right)\left(x+y+1\right)\)
d:
Sửa đề: x^2+4x-2xy-4y+y^2
=x^2-2xy+y^2+4x-4y
=(x-y)^2+4(x-y)
=(x-y)(x-y+4)
e: =x(x^2-2x+1)
=x(x-1)^2
f: =2(x^2+2x+1-y^2)
=2[(x+1)^2-y^2]
=2(x+1+y)(x+1-y)
a) x3-2x2-x+2
=x(x2-1)+2(-x2+1)
=x(x2-1)-2(x2-1)
=(x2-1)(x-2)
b)
x2+6x-y2+9
=x2+6x+9-y2
=(x+3)2-y2
=(x+3-y)(x+3+y)
x2 + y2 + 2xy - 2x - 2y
= (x2 + 2xy + y2) - (2x + 2y)
= (x + y)2 - 2(x + y)
= (x + y)(x + y + 2)
a)
\(2x^2y-8xy^2\\ =2xy\left(x-4y\right)\)
b)
\(x^2-2xy+y^2-16\\ =\left(x^2-2xy+y^2\right)-16\\ =\left(x-y\right)^2-16\\ =\left(x-y-4\right)\left(x-y+4\right)\)
A = x^2 + y^2 + 2xy - 2x -2y +1
= (x+y)^2 -2.(x+y) + 1
=(x+y -1 )^2
\(=x^2+y^2+1-2x-2y+2xy-4\)
\(=\left(x+y-1\right)^2-2^2\)
\(=\left(x+y-3\right).\left(x+y+1\right)\)
\(x^3+y^3+2x^2+2xy\)
\(=\left(x+y\right).\left(x^2-xy+y^2\right)+2x.\left(x+y\right)\)
\(=\left(x+y\right).\left(x^2-xy+y^2+2x\right)\)
(2xy+1)2-(2x+y)2
=(2xy+1-2x-y)(2xy+1+2x+y)
=[(2xy-y)-(2x-1)][(2xy+y)+(2x+1)]
=[y(2x-1)-(2x-1)][y(2x+1)+(2x+1)]
=(2x-1)(y-1)(2x+1)(y+1)