Question

x^4+x^2y^2+y^4 (因式分解）

Answer 1

应该是这样

x^4+x^2y^2+y^4

=[(x^2)^2+2x^2y^2+(y^2)^2]-x^2y^2

=(x^2+y^2)^2-(xy)^2

=(x^2+y^2-xy)-(x^2+y^2-xy)