求翻译：我们首先研究含两个自变量的二阶线性方程,再对方程进行化简,我们看到,两个自变量的二阶线性方程通过自变量的可逆变换能够化成哪种标准型,要看二次型的代数性质如何来定.由于这个曲线可以是一个椭圆,一个双曲线或者一个抛物线,故我们可以相应地定义方程在一点的类型.从而进行分类.是什么意思？

We first study the second order with two independent variable linear equations, and then simplify the equations, we see that the two independent variables of second order linear equations via the reversible transformation from the variables which can be turned into the standard type, to quadratic al

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We first study including two independent variable two step linear equation, again carries on the simplification to the equation, we saw, which kind of standard type two independent variable two step linear equation can turn into through the independent variable reversible transformation, must look h

We first research containing two a since variable of second-order linear equations, then on equation for of Jane, we see, two since variable of second-order linear equations through since variable of reversible transform can of into which species standard type, to see II times type of algebra nature

We first study the second order with two independent variable linear equations, and then simplify the equations, we see that the two independent variables of second order linear equations via the reversible transformation from the variables which can be turned into the standard type, to quadratic al