3x2y-7x3y2+9xy3-y-5是________次________項式;最高次項是________,常數(shù)項是________,按x的降冪排列是________.

答案:
解析:

五,五,-7x3y2,5,-7x3y2+3x2y+9xy3-y-5或-7x3y2+3x2y+9xy3-5-y


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