来自戴莉萍的问题
1...3a^2(x-y)-27(x-y)b^22...-4a^3b^4+16a^2b^5-16ab^63...a^2-(b^2+c^2-2bc)4...(x+2)(x+4)+x^2-45.9m^2-6m+2n-n^2
1...3a^2(x-y)-27(x-y)b^2
2...-4a^3b^4+16a^2b^5-16ab^6
3...a^2-(b^2+c^2-2bc)
4...(x+2)(x+4)+x^2-4
5.9m^2-6m+2n-n^2
1回答
2020-09-11 22:16