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试题详情及答案解析
化简:(每小题4分,本题满分8分)
(1)x2+5y-4x2-3y-1
(2)
答案:(1)–3x2+2y–1 ;⑵–5x+10y
试题分析:(1)合并同类项即可;(2)去括号后合并同类项.
试题解析:解:⑴x2+5y-4x2-3y-1
=–3x2+2y–1 ;                
(2)
=5x+5y-12x+9y+2x-4y
=–5x+10y .             
考点:整式的加减