usdt是什么货币？怎样换？

是什么货币？怎样换？

What currency? How?

是什么货币？怎样换？

What currency? How?

“求定积分”和“定积分求导”的区别和求法如下：

The distinction and method of “drawing points” and “drawing points for guidance” are as follows:

一、定义不同

I. DIFFERENT DEFINITIONS

1、求定积分从本质上讲求函数的原函数，是函数f(x)在区间[a,b]上的积分和的极限。若定积分存在，则它是一个具体的数值（曲边梯形的面积）。

1. The original function for which the function is essentially sought is the limit to which function f(x) has its points and limits on the area [a, b]. If the logarithm exists, it is a specific value (the area of the curved gradient).

2、定积分求导：名为变限函数求导，是指对变限函数直接求导。一般不积出来（也积不出来），它只是一个函数式子。

2. Numerical fractions for guidance: The name is the variable limit function for guidance, which is directly guided by the variable limit function. Generally, it is not accumulated (and cannot be accumulated), but it is just a function.

二、运算方向不同

II. DIFFERENT DIRECTIONS

1、求定积分：求出原函数后，上下限代入原函数相减就可以了。

1. Sets the points: When you have reached the original function, the upper and lower limits are reduced by the original function.

2、定积分求导：如果定积分的上下限中，至少一个不是常数，是变量x(或变量x的函数)，则对于每一个取定的x值，定积分有一个对应值，这就是积分变限函数了。

2. Departure for guidance: If at least one of the upper and lower limits of the determined points is not a constant and is a variable x (or a function of the variable x), there is a corresponding value for each of the selected X values, that is, the logarithm variable function.