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[函数] 一道函数题

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767056334 posted 2015-3-8 15:37 |Read mode
若关于x的方程$\sqrt{2ax^2+ax+2}=ax+2$恰有一个实数解,则实数a的取值范围。

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tommywong posted 2015-3-11 22:05
咋取值范围了,唯一解了
a=-16,x=1/12

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original poster 767056334 posted 2015-3-20 19:46
有ax+2>=0的限制条件

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longzaifei posted 2015-3-22 12:00
可以设$ax+2=y$
两边平方后,方程恰有一个非负根。

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其妙 posted 2015-3-22 23:38

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kuing posted 2015-3-23 00:06
回复 5# 其妙

什么好像有,明明就是它啊

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