Question

(1)xy的立方-8x的平方y-x的立方y的平方-y的4次方-6,按字母y的降幂排列为?

Answer 1

(1)xy^3-8x^2y-x^3y^2-y^4-6

=-y^4+xy^3-x^3y^2-8x^2y-6

(2)x^2+()-8x^2-1=2x^3+7x-3

()=2x^3+6x^2+7x-2