作业帮求证:(x^2-xy+y^2)^3+(x^2+xy+y^2)^3能被2x^2+2y^2整除
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/05/29 03:21:43
求证:(x^2-xy+y^2)^3+(x^2+xy+y^2)^3能被2x^2+2y^2整除
有公式
a³+b³=(a+b)(a²-ab+b²)
故
(x^2-xy+y^2)^3+(x^2+xy+y^2)^3
=(x^2-xy+y^2+x^2+xy+y^2)((x^2+xy+y^2)^2-(x^2-xy+y^2)*(x^2+xy+y^2)+(x^2+xy-y^2)^2)
=(2x^2+2y^2)((x^2+xy+y^2)^2-(x^2-xy+y^2)*(x^2+xy+y^2)+(x^2+xy-y^2)^2)
有因式2x^2+2y^2
因此
(x^2-xy+y^2)^3+(x^2+xy+y^2)^3能被2x^2+2y^2整除
a³+b³=(a+b)(a²-ab+b²)
故
(x^2-xy+y^2)^3+(x^2+xy+y^2)^3
=(x^2-xy+y^2+x^2+xy+y^2)((x^2+xy+y^2)^2-(x^2-xy+y^2)*(x^2+xy+y^2)+(x^2+xy-y^2)^2)
=(2x^2+2y^2)((x^2+xy+y^2)^2-(x^2-xy+y^2)*(x^2+xy+y^2)+(x^2+xy-y^2)^2)
有因式2x^2+2y^2
因此
(x^2-xy+y^2)^3+(x^2+xy+y^2)^3能被2x^2+2y^2整除
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