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Tag Archives: science
为什么牛顿第一定律不是第二定律的特例
做物理作业，看到这样一句话，说：牛顿第一定律是独立的一条定律，绝不能简单地看成牛顿第二定律的特例。于是，我就不理解了，再于是， Google 之，找到一些，但是不太清楚， 于是 Wikipedia ，在英文版找到了答案： http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion#Newton.27s_first_law:_law_of_inertia Every body perseveres in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed.[8] This law is also … Continue reading
除数为什么不能为零
小学老师曾经讲过除数为什么不能为零，好像是说不能把一堆东西分成0份，所以除数不能为零（除数为零没有意义），现在听来，这好像说不过去。我试着用反正法证了一下，老师、同学看看有没有问题。 证明全文：docx格式 已知：实数a、b、c中，a/b=c 求证：b不能等于0 证明：假设b=0 Tags:Google,science Related Posts 风雨无阻 火炬传全球 (4) 看看我的计算机 (1) 看来高兴得太早了 (3) 用 Google Analytics 时排除内部点击量的小技巧 (12) 某著名搜索引擎被封半小时 (2)