Question

把多项式-a^4+3ab^3+2-3a^2b^2-b^4+3a^3b按字母a的指数由高到低的顺序

Answer 1

按字母a的指数由高到低的顺序：-a^4+3a^3b-3a^2b^2+3ab^3+2-b^4