问题一变成了关于 yx , 的二元函数的极值问题。的翻译：Question becomes about YX, binary function's extremum. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Issue a become on yx, the dual function of extreme problems.

Question becomes about YX, binary function's extremum.

As soon as the question turned about yx, dual function minimum problem.

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Question becomes about YX, binary function's extremum.