试题与答案

已知a﹣a﹣1=5，求a2+a﹣2的值．

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题型：计算题

题目：

已知a﹣a﹣1=5，求a2+a﹣2的值．

答案：

解：∵a﹣a﹣1=5

∴（a﹣a﹣1）2=25

即a2+a﹣2﹣2=25

∴a2+a﹣2=27．

考点：完全平方公式
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