2014年12月31日 · Equation常指方程,用方程来求解未知数,或者解出多个未知数间的对应关系. equation作为等式用的情况我感觉不常见,可能是某些常用的方便计算的式子,或者某些先决条件. inquation也就是不等式用的还要多些. Function是函数,一种普遍的对应关系,通常还要满足单射

An equation is a statement that connects two expressions with an $=$ sign and asserts their equality. An identity is an equation that holds for every variable tuple for which the equation is defined: $\log(xy)\equiv \log(x)+\log(y)$ A conditional equation holds for some variable tuple(s):

2011年10月2日 · If the equations of the diagonals of the rectangle are Ax + By + C = 0 and Dx + Ey + F = 0 then an equation for the rectangle is: M|Ax + By + C| + N|Dx + Ey + F| = 1. M and N can be found by substituting the coordinates of two adjacent vertices of the rectangle. In fact, this equation can be used to describe any parallelogram.

单独成行的行间公式在LaTeX里由equation环境包裹。 更多情况的是，我们需要罗列一系列公式，并令其按照等号对齐。 目前最常用的是align环境，它将公式用 & 分隔为两部分并对齐。

2013年5月28日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

I'm wondering if there is a symbol or notation for Round to the nearest 10th For example, the area of a circle with a radius of 45 feet, rounded to the nearest square foot, could be written as, A =...

2017年4月20日 · Now we are looking for the equation of a circle through the origin and two other points, which is of the form $$(x-x_c)^2+(y-y_c)^2-r^2=x^2-2xx_c+y^2-2yy_c=0,$$ as there is no independent term. This results in the $2\times2$ linear system of equations

2023年9月28日 · Plugging 4 into the equation we get 4(4-1)/2 = 12/2 = 6. So there are 6 possible combinations with 4 items. Applying the intuitive understanding of division as repeated subtraction, we can plot 12 on a numberline, and then since we are dividing by 2, we count backwards by 2 until we reach 0.

2023年9月28日 · Now you may now see how the equation for a circle arises-- it's just the graph of $\pm\sqrt{a^2-(r-c)^2}=z$. Variable c is the length from the origin to the center of the circle while a is the radius of the circle. Now we can expand this into three dimension by replacing the r with $\sqrt{x^2+y^2}$. By then you have two parameters

I found this question in a differential equation textbook as a question. The equation $$ \frac{dy}{dx} =A(x)y^2 + B(x)y +C(x) $$ is called Riccati's equation