A linear integral invariant, a universal integral invariant and an absolute integral invariant of second order of the system are obtained under the given condition.

给出系统存在积分不变量的条件，在此条件下导出系统的线性积分不变量、通用积分不变量和二阶绝对积分不变量。

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A linear integral invariant, a universal integral invariant and an absolute integral invariant of second order of the system are obtained under the given condition.

给出系统存在积分不变量的条件，在此条件下导出系统的线性积分不变量、通用积分不变量和二阶绝对积分不变量。

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