... 简化方案 reduction procedure 通分 reduction to common denominator 冗余；过剩；重复 redundancy ...
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By means of variable substitution and iterative method, this paper puts forth some new higher-order differential equations, and gives their formula of reduction of integrals to common denominator.
借助变量代换、迭代等方法，提出几类新的高阶常微分方程，给出其相应的通积分公式。
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