问题 填空题 将多项式-x4+2x2y2-5y5按字母y降幂排列为______. 答案 将多项式-x4+2x2y2-5y5按字母y降幂排列为-5y5+2x2y2-x4.故答案为:-5y5+2x2y2-x4.