x²-(x-2y)(x+2y)+(x²-y)(y+x²)=?

来源：学生作业帮助网编辑：作业帮时间：2024/04/29 03:14:55

x²-(x-2y)(x+2y)+(x²-y)(y+x²)=?
x²-(x-2y)(x+2y)+(x²-y)(y+x²)=?

x²-(x-2y)(x+2y)+(x²-y)(y+x²)=?
x²-(x²-4y²)+(x^4-y²)
=4y²+x^4-y²
=x^4-3y².

x²-(x-2y)(x+2y)+(x²-y)(y+x²)=x²-(x²-4y²)+x^4-y^2=3y^2+x^4