来自干东英的问题
因式分解(x^3+y^3)-9x^2y^2(x+y)^2
因式分解(x^3+y^3)-9x^2y^2(x+y)^2
1回答
2020-09-11 23:26
因式分解(x^3+y^3)-9x^2y^2(x+y)^2
因式分解(x^3+y^3)-9x^2y^2(x+y)^2
原式=(x+y)(x²-xy+y²)-9x²y²(x+y)²
=(x+y)(x²-xy+y²-9x³y²-9x²y³)