Thực hiện phép tính:
a/(x^2+y^2-2xy)+(x^2+y^2 +2xy)
b/(x^2+y^2-2xy) - (x^2+y^2+2xy)
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\(A=\left(x-y\right)^2-3\left(x-y\right)=10^2-3\cdot10=100-30=70\)
a: \(=15x^5y^3-6x^4y^2-6x^3y^3\)
c: \(=2x^4-2x^2-3x^3+3x+x^2-1\)
\(=2x^4-3x^3-x^2+3x-1\)
Ta có:
VT=(x2+y2)2−(2xy)2VT=(x2+y2)2−(2xy)2
=(x2+y2−2xy)(x2+y2+2xy)=(x2+y2−2xy)(x2+y2+2xy)
=(x−y)2(x+y)2=VP=(x−y)2(x+y)2=VP
⇒đpcm⇒đpcm
a) (x^2+2xy+y^2) : (x+y)
=(x+y)2:(x+y)
=x+y
b) (125x^3+1) : (5x+1)
=(5x+1)(25x2-5x+1):(5x+1)
=25x2-5x+1
c) (x^2-2xy+y^2) : (y-x)
=(x-y)2:(y-x)
=-(x-y)2:(x-y)
=-(x-y)
=-x+y
c: \(=\dfrac{x^3+2x^2+x^2+2x-10x-20}{x+2}\)
\(=x^2+x-10\)
`x/(x+y) + (2xy)/(x^2-y^2) - y(x+y)`
`= (x(x-y))/(x^2-y^2) + (2xy)/(x^2-y^2) - (y(x-y))/(x^2-y^2)`
`= (x^2 - xy + 2xy - xy + y^2)/(x^2-y^2)`
`= (x^2+y^2)/(x^2-y^2)`
\(\dfrac{x}{x+y}+\dfrac{2xy}{x^2-y^2}-\dfrac{y}{x+y}\)
\(=\dfrac{x-y}{x+y}+\dfrac{2xy}{\left(x+y\right)\left(x-y\right)}\)
\(=\dfrac{\left(x-y\right)^2}{\left(x+y\right)\left(x-y\right)}+\dfrac{2xy}{\left(x+y\right)\left(x-y\right)}\)
\(=\dfrac{x^2-2xy+y^2+2xy}{\left(x+y\right)\left(x-y\right)}\)
\(=\dfrac{x^2+y^2}{x^2-y^2}\)
[(x2-2xy+2xy2).(x+2y)-(x2+4y2).(x-y)]2xy
=( x3 + 2x2y-2x2y-4xy2+2x2y2+4xy3-x3+x2y-4xy2+4y3 )2xy
=2xy(2x2y2-8xy2+4xy3+x2y+4y3)
= 4x3y3-16x2y3+8x2y4+2x3y2+8xy4
Trả lời:
[ ( x2 - 2xy + 2xy2 ) ( x + 2y ) - ( x2 + 4y2 ) ( x - y ) ] 2xy
= [ ( x3 + 2x2y - 2x2y - 4xy2 + 2x2y2 + 4xy3 ) - ( x3 - x2y + 4xy2 - 4y3 ) ] 2xy
= ( x3 + 2x2y - 2x2y - 4xy2 + 2x2y2 + 4xy3 - x3 + x2y - 4xy2 + 4y3 ) 2xy
= ( x2y - 8xy2 + 2x2y2 + 4xy3 + 4y3 ) 2xy
= 2x3y2 - 16x2y3 + 4x3y3 + 8x2y4 + 8xy4
a.
(x^2 + y^2 - 2xy) + (x^2 + y^2 + 2xy)
= x^2 + y^2 - 2xy + x^2 + y^2 + 2xy
= (x^2 + x^2) + (y^2 + y^2) + (2xy - 2xy)
= 2x^2 + 2y^2
b.
(x^2 + y^2 - 2xy) - (x^2 + y^2 + 2xy)
= x^2 + y^2 - 2xy - x^2 - y^2 - 2xy
= (x^2 - x^2) + (y^2 - y^2) - (2xy + 2xy)
= -4xy