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\(x^4.y^4+4\)
\(=\left(x^4y^4-2x^3y^3+2x^2y^2\right)+\left(2x^3y^3-4x^2y^2+4xy\right)+\left(2x^2y^2-4xy+4\right)\)
\(=x^2y^2\left(x^2y^2-2xy+2\right)+2xy\left(x^2y^2-2xy+2\right)+2\left(x^2y^2-2xy+2\right)\)
= (x2y2 + 2xy + 2)(x2y2 - 2xy + 2)
\(x^4-2x^2-144x-1295=\left(x+5\right)\left(x-7\right)\left(x^2+2x+37\right)\)
1295^2 - 144 = 1677025 - 144 = 1676881
(x+y) ^ 4 = (x+y) x (x+y) x (x+y) x (x+y) = 4(x+y) + x^4 + y^4 = 4 + 4 + 4 = 4 x 3 = 12
\(\left(x-y\right)\left(z-x\right)\left(z-y\right)\left(z^2+yz+xz+y^2+xy+x^2\right)\)vay ms dung
\(x^4+y^4+\left(x+y\right)^4\)
\(=x^4+y^4+\left(x^2+2xy+y^2\right)^2\)
\(=x^4+y^4+x^4+6x^2y^2+y^4+4x^3y+4xy^3\)
\(=2.\left(x^2+y^2\right)^2+4xy\left(x^2+y^2\right)+2x^2y^2\)
\(=2.\left(x^2+y^2\right)\left(x^2+y^2+2xy\right)+2x^2y^2\)
\(=2.\left[\left(x^2+y^2\right)\left(x+y\right)^2+x^2y^2\right]\)
Sai thì thôi nhé~
\(x^4+y^4+\left(x+y\right)^4\)
\(=x^4+y^4+x^4+4x^3y+6x^2y^2+4xy^3+y^4\)
\(=2x^4+4x^3y+6x^2y^2+4xy^3+2y^4\)
\(=2\left(x^4+2x^3y+3x^2y^2+2xy^3+y^4\right)\)
\(=2\left[\left(x^4+2x^3y+x^2y^2\right)+2\left(x^2+xy\right)y^2+y^4\right]\)
\(=2\left[\left(x^2+xy\right)^2+2\left(x^2+xy\right)y^2+\left(y^2\right)^2\right]\)
\(=2\left(x^2+xy+y^2\right)^2\)
(x^10+y^10)(x^2+y^2)-(x^8+y^8)(x^4+y^4)
=x^12+x^10y^2+y^10x^2+y^12-x^12-x^8y^4-x^4y^8-y^12
=x^10y^2+y^10x^2-x^8y^4-x^4y^8
=x^2y^2(x^8+y^8-x^6y^2-x^2y^6)
=x^2y^2[x^6(x^2-y^2)+y^6(y^2-x^2)]
=x^2y^2[x^6(x-y)(x+y)-y^6(x-y)(x+y)]
=x^2y^2(x^6-y^6)(x-y)(x+y)
=x^2y^2(x-y)(x+y)(x^2+xy+y^2)(x^2-xy+y^2)(x-y)(x+y)
=x^2y^2(x-y)^2(x+y)^2(x^2+xy+y^2)(x^2-xy+y^2)
Có: \(\left(x+y\right)^4+x^4+y^4\)
\(=\left(x+y\right)^4+\left(x^2+y^2\right)^2-2x^2y^2\)
\(=\left[\left(x+y\right)^4-x^2y^2\right]+\left[\left(x^2+y^2\right)^2-x^2y^2\right]\)
\(=\left[\left(x^2+y^2+2xy\right)^2-\left(xy\right)^2\right]+\left[\left(x^2+y^2\right)^2-\left(xy\right)^2\right]\)
\(=\left(x^2+y^2+xy\right)\left(x^2+y^2+3xy\right)+\left(x^2+y^2+xy\right)\left(x^2+y^2-xy\right)\)
\(=2\left(x^2+y^2+xy\right)\left(x^2+y^2+xy\right)=2\left(x^2+y^2+xy\right)^2\)