Question

代數(shù)式-的系數(shù)是________，次數(shù)為________．

Answer 1

    3
分析：根據(jù)單項(xiàng)式系數(shù)、次數(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)，所有字母的指數(shù)和叫做這個(gè)單項(xiàng)式的次數(shù)．
解答：根據(jù)單項(xiàng)式系數(shù)、次數(shù)的定義，代數(shù)式-的數(shù)字因數(shù)-即系數(shù)，所有字母的指數(shù)和是1+2=3，故次數(shù)是3．
故答案為：-，3．
點(diǎn)評(píng)：考查了單項(xiàng)式的定義，確定單項(xiàng)式的系數(shù)和次數(shù)時(shí)，把一個(gè)單項(xiàng)式分解成數(shù)字因數(shù)和字母因式的積，是找準(zhǔn)單項(xiàng)式的系數(shù)和次數(shù)的關(guān)鍵．