并直接推出了二级曲线的五种标准方程。
And five standard equations of conics are also directly deduced.
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设计人员可用这些方程作为一个标准，对提出的设计修改作出评价。
The designer can use the equations as a standard against which proposed design changes.
这个函数求解一个标准的二次方程。
This function solves a standard quadratic equation.
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