1.—2x^5n-1y^n+4x^3n-1y^n+2-2x^n-1y^n+42.x^2+4y^2+9z^2-4xy-12yz+6xz3.3x^2y^2-17mnxy+10m^2n^24.(a^2-3a+2)x^2+(2a^2-4a+1)xy+(a^2-a)y^2^2就是2次方,^3就是三次方4x^3n-1就是4X的3N-1次方

Question

1.—2x^5n-1 y^n +4x^3n-1 y^n+2 -2x^n-1 y^n+4
2.x^2 +4y^2 +9z^2 -4xy-12yz+6xz
3.3x^2 y^2 -17mnxy+10m^2 n^2
4.(a^2 -3a+2)x^2+(2a^2 -4a+1)xy+(a^2 -a)y^2
^2就是2次方,^3就是三次方 4x^3n-1 就是4X的3N-1次方

Answer 1

1. 题目的加减号应该写错了,应该是这样的 2x^5n-1 y^n -4x^3n-1 y^n+2 +2x^n-1 y^n+4 =2x^n-1y^n(x^4n-2x^2ny^2+y^4) =2x^n-1y^n(x^2n-y^2)^2 =2x^n-1y^n(x^n+y)^2(x^n-y)^22. x^2 +4y^2 +9z^2 -4x...