有趣的数学【10】:人生就像俄罗斯套娃

in #steempress5 years ago

人生不如意十之八九。

很多时候,麻烦就像苍蝇,嘤嘤嗡嗡围着你转,而且声音越来越大,看得见听得着但是打不到,能把人给烦死。

而且心情越差,麻烦越多,简直是层层叠叠环环相扣排山倒海而来,好容易刚应付掉一个麻烦,却发现下面还隐藏着n个麻烦,就像俄罗斯套娃。

这就像是上天的考验,如果难以承受压力因此奔溃,那就看不到解决问题撑过去后的无限风光了。


解数学题也和人生差不多。

我们来看这道题:
image
开根很难心算或是笔算写出来,因此,根号属于数学里面的小麻烦。而且这道题是大根号套小根号,属于俄罗斯套根号。

一般,碰到重二次根式,最先做的就是解决掉最外面的那个大麻烦——把大根号先去掉。

去二次根号的方法,就是对根号里的部分进行配平方。

而这道题考察的的重点知识是: √a x √b=√(a x b)

 

根据这个原理,带入算式,进行配方,先解决最大的那个根号:
image

将√2 + √3 带入原式,可得:
a + b√2 + c√3 = √2 + √3

这时其实已经可以看出a,b,c的值了,但我们还是列算式看一下:
image

我们将a=0,b=1,c=1代入原式,可得:
原式 = 2×0 + 199×1 + 1001×1 = 2000。


做题其实和做人一样,看到一堆麻烦的时候不能慌,不能害怕逃避,否则永远解决不了问题。

一个成熟的人,要做到泰山崩于前而面不改色,当麻烦排山倒海压来的时候,沉着冷静,先把所能见到的最近的麻烦解决了,往往剩下的麻烦就变成了小麻烦,自然就迎刃而解了。


附上完整解题步骤:
image


Posted from my blog with SteemPress : https://kissfirer.000webhostapp.com/maths10

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