简单的说： 光圈F值 = 镜头的焦距/镜头口径的直径。 咱们控制变量，默认为同焦距镜头，那么 光圈数值可以理解为光圈直径（半径）的倒数。

A function basically relates an input to an output, there’s an input, a relationship and an output. For every input... AI may present inaccurate or offensive content that does not represent …

first thing f sends 3 to 2 and f −1 sends 2 to 3. the slopes of f at 2 and of (f −1)′ at 3 are reciprocals. here is one way to see that. since f has slope 6 at x =3,y = 2. ... You could also observe f is monotonic, and try your luck (pardon, intuition) checking "easy" values.

To convert Fahrenheit to Celsius: f (F) = (F - 32) × 5 9. The Inverse Function (Celsius back to Fahrenheit): f-1(C) = (C × 9 5) + 32. For you: see if you can do the steps to create that inverse! It has been easy so far, because we know the inverse of Multiply is Divide, and the inverse of Add is Subtract, but what about other functions?

2023年7月8日 · 因为f是 奇函数 所以f (0)=0，因为周期为4，所以f (-2)=f (2)=-f (2)，由此推出f (2)=f (0)=0，再根据 周期性 可得f (2022)=f (2)=f (0)=0。

本文记录一些随处看到的斐波那契数列的性质。 有些零散，没有什么系统化的条理。 性质1：每n个斐波那契数中有且仅有1个数能被F (n)整除. 证明： 这个需要用到昨天讲过的定理1. 证明可以看昨天的文章: 首先， n=m 时，也就是第n个数 F (n) 能被它本身整除, 那么 F (2n) , F (3n) ……能被 F (n) 整除，因为 2n , 3n ……能被n整除。 注意，这里只证明了有. 那么怎么证明只有一个呢？ 可以用定理2和定理3： 假设存在一个k满足 0<k<n ,在 F (a*n) 和 F (a*n+n) (a∈Z)存在一个 F …

Replace y y by f (x) f (x). Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.

Verify if f −1(f) = 2 f f - 1 (f) = 2 f is the inverse of f (f) = f −1(2) f (f) = f - 1 (2). Tap for more steps... Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.

反函数y=f ^ (-1)（x）的定义域、值域分别是函数y=（x）的值域、定义域。 最具有代表性的反函数就是对数函数与指数函数。 一般地，如果x与y关于某种对应关系f（x）相对应，y=f（x），则y=f（x）的反函数为x=f (y)或者y=f⁻¹（x）。

Combine 1 f 1 f and 2 2. Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.