...y(不等式 不等式 不等式 不等式) : 详解不同层次的不等式︰ 简易不等式 (Simple inequality)、二次不等式(Quadratic inequality)、三次不等式 (Cubic inequality) 以至于九十几次不等式都可以识做。
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解答二次不等式，选用代数方法比数轴标根法有更高的正确率；
While most of the students use algebraic manipulations, some adopted the method of using the number line, and still some few solve by sketching the graphs.
通过给出几个实例，介绍了利用二次型的半正定性证明不等式的方法。
The author introduce the method of applying positive semi-definite quadratic form to prove inequality by giving several examples.
本文针对离散区间2 - D系统的二次稳定性问题，给出了线性矩阵不等式形式的判定条件。
This paper presents a condition in terms of linear matrix inequalities (LMIs) for the quadratic stability of discrete-time interval 2-d systems.
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