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a平方加3a加9等于零则a立方等于多少

更新时间: 2021-05-21 17:16:08     

1.a 平方加3a加9等于零,可以化成 (a+3/2)的平方加上 27/4等于0,所以结果恒大于等于27/4,方程不成立,因此在实数范围内无解。

2. 也可以用用求根公式,可以知道δ小于0,a无实数解。

关键词: 平方 3a 等于 立方 多少

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