Question

（2013•岳陽）單項(xiàng)式-5x²y的系數(shù)是

-5

．

Answer 1

分析：根據(jù)單項(xiàng)式系數(shù)的定義來選擇，單項(xiàng)式中數(shù)字因數(shù)叫做單項(xiàng)式的系數(shù)．

解答：解：-5x²y=-5•x²y，所以該單項(xiàng)式的系數(shù)是-5．
故答案是：-5．

點(diǎn)評(píng)：本題考查了單項(xiàng)式的定義．確定單項(xiàng)式的系數(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)的關(guān)鍵．