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１．填空（每空３分）（１）单项式－ｘｙ５的系数是，次数是．（２）并且的项，是同类项．（３）３ｘｎ－（ｍ－１）ｘ＋１为三次二项式，则－ｍ＋ｎ２＝．（４）５ｘ＋３ｘ２－４ｙ２＝５ｘ－（ ）．（５）２ｘ２ｙ３－３ｘ３ｙ＋８ｘ５ｙ１０是次项式．（６）若ｘ＋ｙ＝
1. Fill the blanks (3 points per null) (1) The coefficient of the monomial -xy5 is, the number of times is. (2) And the item is the same item. (3) 3xn- (m-1) x + 1 is a cubic polynomial, then -m + n2 =. (4) 5x + 3x2-4y2 = 5x- (). (5) 2x2y3-3x3y + 8x5y10 is the second term. (6) If x + y =