问题
填空题
把多项式3x3y-y4-5xy3+x2y2+7x4按x的降幂排列为______.
答案
多项式3x3y-y4-5xy3+x2y2+7x4的各项为3x3y,-y4,-5xy3,x2y2,7x4,
按x的降幂排列为7x4+3x3y+x2y2-5xy3-y4.
故答案为:7x4+3x3y+x2y2-5xy3-y4.
把多项式3x3y-y4-5xy3+x2y2+7x4按x的降幂排列为______.
多项式3x3y-y4-5xy3+x2y2+7x4的各项为3x3y,-y4,-5xy3,x2y2,7x4,
按x的降幂排列为7x4+3x3y+x2y2-5xy3-y4.
故答案为:7x4+3x3y+x2y2-5xy3-y4.