Method of completing square is often used when transforming a quadratic form into a normal one, whose process is equivalent to making the relevant matrix contract diagonal.

二次型化标准形常采用配方法，而二次型化标准形等价于它的矩阵合同对角化，文中利用初等矩阵和初等变换之间的关系。

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The extremal formula of binary quadratic functions is studied by using method of undetermined coefficients, substitution method and method of completing the square.

用特定系数法、换元法、配方法探求二元二次函数的极值公式。

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A new method of completing the square with reverse order is presented by change quadric form into standard form.

提出了一种新的将二次型化为标准型的配方法——逆序配方法。

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