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  • 不定积分符号为什么是∫dx?为什么要加一个dx?是不是多此一举了? - 知乎
    不定积分符号为什么是∫dx? 为什么要加一个dx? 是不是多此一举了? 这样对于初学者很容易把不定积分和定积分给弄混啊 显示全部 关注者 287
  • 微分符号,dx,dy到底是什么含义? - 知乎
    其中一派被称之为 实无穷派,他们最大的特点认为无穷小量是一种实实在在的量,可以和其他实数一起参与代数运算,比如加减乘除,代入到基本函数里面。比如,实无穷派可以内心毫无波澜地写成下面的等式 dy=sin (x+dx)-sin (x)=2cos (x+\frac {dx} {2})sin (\frac {dx} {2})\approx cos (x)dx 另外,无穷小量和实数
  • What does the dx mean in an integral? [duplicate]
    The " dx d x " lets people think informally that you're multiplying a height, f(x) f (x), by an "infinitesimal width", dx d x, and then taking an infinite sum
  • calculus - Finding $\int x^xdx$ - Mathematics Stack Exchange
    These identities for dx d x and dx d x are sometimes called the "sophomore's dream" Look that up on Wikipedia
  • 微分符号 dx、dy 表示什么含义? - 知乎
    微分符号 dx、dy 表示什么含义? 微分 dx、dy 与导数 dy dx 的关系是什么? 为什么 dy dx 等于 f(x)的导数,即 dy dx=f'(x)。 将 dx 移到等号右边就是微… 显示全部 关注者 2,210 被浏览
  • What is $dx$ in integration? - Mathematics Stack Exchange
    If f(x) f (x) is in meters per second and dx d x is in seconds, then f(x)dx f (x) d x is in meters, and so is the integral These things should be dimensionally correct, and are not so without the " dx d x " Sometimes one has a dot-product or a cross-product or a matrix product or some other sort of product between f(x) f (x) and dx d x
  • 导数符号中,dx 的含义是什么? - 知乎
    概念的话dx就是把定义域的x范围无限分(微分)其中的一份如x1 到x2 这一小段就是dx。 同理,dy就是值域的无限分为f (x2)-f (x1)。 dy dx 是f (x)一个微分成dx dy围成的小三角形的tan值。等同于导数值。但这只是宏观上的。如果微观的话,dy dx与f (x)在m点的切线T斜率(也就是导数值)f'并不相等。中间差




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