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在函数问题中 ,当变元出现的次数不止一次时 ,我们就不便于作出函数的图象或讨论函数的性质 .因此经常需要减少变元出现的次数 ,直至其仅仅出现一次 .这就是减元的思想 .减元类似于消元而又不同于消元 .现将几类常见函数减元的思想方法作一总结 :1 一元二次函数ｙ =ａｘ2 +ｂ?
In the function problem, when the arguments appear more than once, we are inconvenient to make an image of the function or discuss the nature of the function. Therefore, it is often necessary to reduce the number of occurrences of the argument until it only occurs once. This is the subtractive element. The idea is that the subtractive element is similar to the elimination element and is not the same as the elimination element. We will now summarize the thinking methods of several common functional subtractive elements: 1 A quadratic function y = ax2 + b?