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如何用java实现如下功能

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如何用java实现如下功能

ab/cd=10
a，b，c，d都是整数，在20-50之间，求结果是(9.9-10.1范围内)的排列组合

其中范围 20-50 可变
结果的误差也可变 如果误差是0.5 那就是9.5-10.5之间

求所有符合条件的ab/cd的组合


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