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第十三届“希望杯”高二培训第68题的关键是如何突破xy项.命题委员会给出的解法是直接从xy项入手,用待定系数法与基本不等式结合来突破xy顶,可谓新奇独特,但技巧性强.事实上,一道题的“突破点”是很多的,只要我们善于捕捉,就可以巧妙突破.
The key point of the thirteenth “Hope Cup” high school training question 68 is how to break through the xy term. The solution given by the Propositional Committee is to start with the xy item directly, using the undetermined coefficient method and the basic inequality to break through the xy top, which is unique and unique. , but it is skillful. In fact, there is a lot of “breakthrough points” for a question. If we are good at catching, we can make a breakthrough.