2b²c²+2c²a²+2a²b²-a^4-b^4-c^4
=-(a-b-c)(a+b-c)(a-b+c)(a+b+c)
2x²+5xy-4y²
此式无法分解
(y+1)^4+(y+3)^4-272
=2(y-1)(y+5)(y^2+4y+19)
(xy-1)²+(x+y-2)(x+y-2xy)
=(x-1)^2(y-1)^2
x^4-x^3+4x²+3x+5
(x^2-2x+5)(x^2+x+1)
~~~~~~~~~~~求采纳~~~~~~~~~~~
2b²c²+2c²a²+2a²b²-a^4-b^4-c^4
=-(a-b-c)(a+b-c)(a-b+c)(a+b+c)
2x²+5xy-4y²
此式无法分解
(y+1)^4+(y+3)^4-272
=2(y-1)(y+5)(y^2+4y+19)
(xy-1)²+(x+y-2)(x+y-2xy)
=(x-1)^2(y-1)^2
x^4-x^3+4x²+3x+5
(x^2-2x+5)(x^2+x+1)
~~~~~~~~~~~求采纳~~~~~~~~~~~