5、平时分拿满分,就为了上我的课刷行测?

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    5、平时分拿满分,就为了上我的课刷行测?(第1/2页)
    “斜率?”
    张洪涛微微挑了下眉,不置可否。
    这个词确实是前面几节课讲过的,而且对于在场一众学生来说,这个知识点甚至在高中的时候就讲过了。
    这,并不属于超纲知识。
    但如何用斜率来证明这道题,他们还是很茫然。
    都不明白,斜率这玩意儿也能用来证明“解的非唯一性”?
    “感觉跟这道题没什么关系啊!”
    有人小声嘀咕着。
    林枫没有废话,直接在黑板右边画了一个坐标系。
    “y‘=y^(2/3),这个方程的意思是,在平面上任意一个点(x,y)处,解曲线经过这个点时的斜率就是y^(2/3)。”
    “那我们来看看y=0这条线附近会发生什么。”
    他在x轴上方标了几个点,分别标注了对应的斜率值。
    “当y=0.1的时候,斜率是0.1^(2/3)≈0.215。”
    “当y=0.01的时候,斜率是0.01^(2/3)≈0.046。”
    “当y=0.001的时候,斜率是0.001^(2/3)≈0.01。”
    他边写边说着:
    “大家注意到没有,y越接近0,斜率越接近0。”
    “也就是说,在y=0附近,解曲线几乎是平的。”
    说到这里,他在坐标系上画了一条沿着x轴趋近的曲线。
    “那y=0本身呢?斜率是0^(2/3)=0,完全是平的。”
    “所以y恒等于0,也就是x轴本身,它就是一条解曲线,而且斜率处处为零,完全躺在x轴上。”
    台下有人嗤笑了一声,但很快又憋了回去。
    因为他发现周围所有人都听得全神贯注。
    打游戏的不打了,看小说的不看了,听歌的不听了。
    全都沉浸在了林枫的讲解中:
    “但问题在于,分离变量法还能解出另一条解曲线y=(x/3)。”
    “这条曲线在x=0的时候,y(0)=0,也经过原点。”
    “而且在原点附近,y=(x/3)的值非常小,对应的斜率y^(2/3)也非常小,和x轴几乎贴在一起。”
    说着,他在图上又画出了第二条曲线,从原点出发,缓缓上升。
    可以看到,两条曲线在原点处完美重合。
    “这,就是问题所在。”
    他在两条曲线的交点处画上了一个圆圈。
    “在这个点上,两条解曲线的斜率是一样的,都是零。”
    “方向场在这个点给不出任何区分,你沿着x轴走可以,你顺着(x/3)走也可以。”
    “方向场在这里分不清该往哪儿走,所以两个解都成立。”
    他放下粉笔,目光扫视整个教室,最后又看向张洪涛。
    “这就是为什么解不唯一。”
    “不是因为方程有什么错误,而是因为在y=0这个点,方程给出的方向指引太模糊了,模糊到两条完全不同的路径都符合要求。”
    “用之前您讲过的话来说就是方向场在这个点退化了。”
    他的讲解结束了,但整个教室却依旧像是被人按下了暂停键。
    没有半点声音!
    张洪涛双手抱胸,目光紧紧盯着黑板上的推导过程,眼神复杂。
    两条曲线从原点出发,一条贴着x轴躺下,一条缓缓上扬。
    交点处一个圆圈,旁边写着“方向场退化”五个字。
    简洁。
    直观。
    漂亮。
    如果说前面的利普希茨条件是完美,那刚刚讲的斜率就是极其完美。
    “方向场退化……”
    他看着,又忍不住念着,语速很慢很慢。
    其实,正如林枫猜想的那样,他出这道题也是为了检验前面学过的斜率知识学生们掌握的如何。
    但他对于这道题能否解决,并没有抱有希望。
    这些年来,他在江阳师范带过的数院学生没有一千也有八百,每年都会出一个类似的变种题,但无一例外,用方向场的几何直觉去解释解的非唯一性,这个思路都想不到。
    而且他也没讲过,因为没必要。
    考试不考这个角度,学生也理解不了。
    他本来想的是,谁要是能想到从斜率出发,那就可以算是做对了,这种数学思维,平时分给个满分也没有什么。
    但,林枫不仅给出了利普希茨条件的超纲解法,更是给出了斜率的思路,并且把整个推导过程讲的一清二楚、明明白白。
    这真的令他太惊讶了。
    没忍住,伸出双手,鼓起掌来。
    啪!
    啪!
    啪!
    掌声在安静的教室里显得格
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