分析:根據(jù)單項(xiàng)式的系數(shù)與次數(shù)的定義求單項(xiàng)式
-的系數(shù)和次數(shù);多項(xiàng)式2ab-5a-10a
2b由三個(gè)單項(xiàng)式組成,其中-10a
2b的次數(shù)為3,在各單項(xiàng)式中次數(shù)最高,則根據(jù)多項(xiàng)式的有關(guān)概念即可得到多項(xiàng)式2ab-5a-10a
2b是3次三項(xiàng)式.
解答:解:?jiǎn)雾?xiàng)式
-的系數(shù)是-
,次數(shù)是4;多項(xiàng)式2ab-5a-10a
2b是3次三項(xiàng)式.
故答案為-
,4;3,三.
點(diǎn)評(píng):本題考查了多項(xiàng)式: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),其中不含字母的項(xiàng)叫做常數(shù)項(xiàng).多項(xiàng)式中次數(shù)最高的項(xiàng)的次數(shù)叫做多項(xiàng)式的次數(shù).也考查了單項(xiàng)式.