Question

代數(shù)式－的系數(shù)是________次數(shù)是_______

Answer 1

-    3

把單項(xiàng)式-分解成數(shù)字因數(shù)和字母因式的積，然后找出它的次數(shù)和系數(shù)即可．
解：∵-=-?x²y，
∴代數(shù)式-的系數(shù)是-，次數(shù)是3；
故答案是：-，3．
考查了單項(xiàng)式．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．分別找出單項(xiàng)式的系數(shù)和次數(shù)的規(guī)律也是解決此類問題的關(guān)鍵．