Question

-

7

3

a2bc3的系數(shù)是

-

7

3

； 2x+1-3x²的次數(shù)是

2

．

Answer 1

分析：根據(jù)單項(xiàng)式系數(shù)的定義來求解，單項(xiàng)式中數(shù)字因數(shù)叫做單項(xiàng)式的系數(shù)；
由于多項(xiàng)式的最高項(xiàng)-3x²的次數(shù)是2次，根據(jù)多項(xiàng)式次數(shù)的定義，該多項(xiàng)式為2次多項(xiàng)式．

解答：解：根據(jù)單項(xiàng)式系數(shù)的定義，單項(xiàng)式-

7

3

a2bc3的系數(shù)是 -

7

3

；
 2x+1-3x²的次數(shù)是2．
故答案為：-

7

3

；2．

點(diǎn)評(píng)：考查了單項(xiàng)式和多項(xiàng)式，本題屬于簡單題型，注意單項(xiàng)式中的數(shù)字因數(shù)叫做單項(xiàng)式的系數(shù)．多項(xiàng)式里次數(shù)最高項(xiàng)的次數(shù)，叫做這個(gè)多項(xiàng)式的次數(shù)．