以下是 2012 純數的某基本題：
大概值 1 至 2 分吧。運用 wolframalpha 立即得到答案，只要往
輸入
partial fraction (2x-23)/((2x+1)(2x+5)(2x+7))
「立即」得到：
今天沒純數，但教初中的同事也可擬題如下：
要尋找常數 
輸入
partial fraction -(x-1)/(x^2-5x+6)
即可。
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