问题
解答题
3n-[5n+（3n-1）]．
答案
3n-[5n+（3n-1）]=3n-[5n+3n-1]
=3n-[8n-1]
=3n-8n+1
=-5n+1．
故答案为-5n+1．
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3n-[5n+（3n-1）]．
3n-[5n+（3n-1）]=3n-[5n+3n-1]
=3n-[8n-1]
=3n-8n+1
=-5n+1．
故答案为-5n+1．