有趣的数学【13】:条条道路通罗马

in #steempress5 years ago

一道数学题,可能有好几种解法。今天就来看看怎么用另一种方法来求解昨天有趣的数学【12】的这道题:

昨天是利用韦达定理和一元二次方程根的判别式来做的,今天来偷懒一下,纯粹用技术来解决。

由a+b+c = 3,可得:
image

又因为a²+b²+c² = 3,所以
a²+b²+c² = ab+bc+ac
再配方,可得:
image

又因为a+b+c = 3,可得:
a=b=c=1

而1的任何次方等于1,所以原式 = 1+1+1 = 3

看,就是这么简单,比昨天简单太多了。

这就是条条道路通罗马。如果各位有兴趣的话,我还有第3条路来解这道题。


附部分解题步骤:
image


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