Question

18．單項(xiàng)式-3×10²x²y²z的系數(shù)、次數(shù)分別是-3×10²；5．

Answer 1

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)和叫做這個單項(xiàng)式的次數(shù)．

解答 解：根據(jù)單項(xiàng)式定義得：單項(xiàng)式-3×10²x²y²z的系數(shù)是-3×10²、次數(shù)分別是5．
故答案為：-3×10²； 5．

點(diǎn)評 此題考查了單項(xiàng)式系數(shù)、次數(shù)的定義，確定單項(xiàng)式的系數(shù)和次數(shù)時，把一個單項(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．