问题详情：
化简：3x2－5x一6－7x2－6x＋15
【回答】
3x2－5x–6－7x2－6x +15
=（3－7）x2+（－5－6）x +（－6+15）·············································· 1分
= －4x2－11 x +9················································································· 2分
知识点：整式的加减
题型：计算题
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