Question

單項(xiàng)式-xy³的系數(shù)是________，次數(shù)是________．4y³-3y²+2y-1是單項(xiàng)式4y³、________的和．

Answer 1

-    4    -3y²，+2y，-1
分析：根據(jù)單項(xiàng)式的次數(shù)系數(shù)定義可得答案；單項(xiàng)式中的數(shù)字因數(shù)叫做單項(xiàng)式的系數(shù)，一個(gè)單項(xiàng)式中所有字母的指數(shù)的和叫做單項(xiàng)式的次數(shù)．
根據(jù)幾個(gè)單項(xiàng)式的和叫做多項(xiàng)式，每個(gè)單項(xiàng)式叫做多項(xiàng)式的項(xiàng)，可得答案．
解答：?jiǎn)雾?xiàng)式-xy³的系數(shù)是-，次數(shù)是4．
4y³-3y²+2y-1是單項(xiàng)式4y³、-3y²，+2y，-1的和；
故答案為：-；4；-3y²，+2y，-1．
點(diǎn)評(píng)：此題主要考查了單項(xiàng)式與多項(xiàng)式，關(guān)鍵是掌握單項(xiàng)式與多項(xiàng)式的定義．