Question

單項(xiàng)式-a³b⁴的系數(shù)是

-1

，多項(xiàng)式3ab-4a²b³-5ab²+7的次數(shù)是

5

，常數(shù)項(xiàng)是

7

．

Answer 1

分析：根據(jù)單項(xiàng)式系數(shù)的定義和多項(xiàng)式的次數(shù)和常數(shù)項(xiàng)的定義來(lái)求解．單項(xiàng)式中數(shù)字因數(shù)叫做單項(xiàng)式的系數(shù)；多項(xiàng)式的次數(shù)是多項(xiàng)式中最高次項(xiàng)的次數(shù)．

解答：解：?jiǎn)雾?xiàng)式-a³b⁴的系數(shù)是-1，多項(xiàng)式3ab-4a²b³-5ab²+7的次數(shù)是5，常數(shù)項(xiàng)是7．
故答案為：-1，5，7．

點(diǎn)評(píng)：本題主要考查了多項(xiàng)式的次數(shù)的定義．多項(xiàng)式中未知數(shù)的次數(shù)總和的最大值即為多項(xiàng)式的次數(shù)．