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在列方程(组)解实际问题时,经常涉及的量较多,量与量之间的关系不太明显,直接设未知数就不容易解决问题,此时需要设一些辅助未知数,把那些不明显的数量关系表示出来．在求解的过程中,我们可以根据方程(组)的特点,灵活变形,不求出辅助未知数的值,而是把辅助未知数巧妙消去,从而得到问题的解答．我们称这种方法为“设而不求”．
When formulating equations (groups) to solve practical problems, the quantity often involved is relatively large, and the relationship between quantity and quantity is not obvious. It is not easy to solve the problem by directly setting unknown numbers. At this time, some auxiliary unknowns need to be set, and those that are not obvious The quantitative relationship is expressed. In the process of solving, we can flexibly deform according to the characteristics of the equations (groups), instead of finding the values of the auxiliary unknowns, we can eliminate the auxiliary unknowns ingeniously and get the answers to the questions. We call this method “set rather than demand.”