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１９９９年第３期《中学数学》刊登了陈宽国老师的文章“函数ｆ（ｘ）＝Ａａ１ｘ＋ｂ１＋Ｂａ２ｘ＋ｂ２的值域的几何求法”，读后颇有启发．并且马上产生了写作此文的想法，聊以助兴．例１ 求函数ｆ（ｘ）＝ｘ２＋４＋ｘ２－１０ｘ＋３４的最小值．解析１ 用立体几何知识．?
In the third edition of “Mathematics of Middle School”, published in the article titled “Geometry of the Range of Function f(x)=Aa1x+b1+Ba2x+b2” by Professor Chen Kuo-guo, it was instructive after reading. And immediately came up with the idea of writing this article and talked about it. Example 1 Find the minimum value of the function f(x)=x2+4+x2-10x+34. Analytic 1 uses solid geometry knowledge. ?