3A^(N+3)-9A^(N+2)+5A^(N+1)-2A^N与-A+10A^(N+3)-5A^(N+1)-7A^(N+2)的差是( ).
问题描述:
3A^(N+3)-9A^(N+2)+5A^(N+1)-2A^N与-A+10A^(N+3)-5A^(N+1)-7A^(N+2)的差是( ).
答
差是(-7A^(N+3)-2A^(N+2)-5A^(N+1)-2A^N+A).