a²-3a=-1 问a等于几
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a²-3a=-1 问a等于几
a²-3a=-1 问a等于几
a²-3a=-1 问a等于几
答案:a=(3-√5)/2
(a-1.5)²=1.25
a=(3±√5)/2
代入可知a=(3+√5)/2不是a的解
所以,a=(3-√5)/2