How to draw the vector diagram of the circuit, take this problem as an example to draw it~

How to draw the vector diagram of the circuit, take this problem as an example to draw it~

1. The maximum power is the power factor of 1, there are JXL = - JXC, XL = WL, XC = 1 / WC, w = 2500, C = 8U can be solved to get L. R can be solved by using the maximum power transmission formula: Pmax = UOC ^ 2 / 4R = 100, UOC = 10. Then the quality factor Q = ω L / R

The father gazed up and down at his son. He was so excited that his eyes were filled with tears and he couldn't speak for a long time

Gazing is the contradiction between gazing at the same point and "up and down"
The father looked up and down at his son. He was so excited that he burst into tears and couldn't speak for a long time

Sum: 1-2-178; + 3-178; - 4-178; + 5-178; - 6-178; + +99²-100²
Summation of special sequence of numbers

1²-2²+3²-4²+5²-6²+… +99²-100²=(1+2)(1-2)+(3+4)(3-4)+...+(99+100)(99-100)=-1-2-3-4-...-99-100=-(1+2+...+100)=-100×(1+100)÷2=-5050;

Input two matrices and find the product of the two matrices
It's a C + + program

#include <iostream>using namespace std;int main(){\x05int row1=0,row2=0,cow1=0,cow2=0;\x05int i=0,j=0,k=0,temp=0;\x05int array1[20][20],array2[20][20],array[...

How many people are there in a boat? How many boats are there? How many boats are there?

We've chartered x ships
3x+16=5x-4
x=10
3*10+16=46
A: a total of 46 people and 10 ships

How does LIM (x → 0) arctanx / 2x = 1 / 2 come from

1. Let's expand arctanx with Taylor
2. Lobida's law

It is known that the odd function f (x) is a monotone decreasing function in [- 2,2]. The solution to the inequality: XF (2x-1)

∵ f (x) is an odd function on [- 2,2]
∴f(0)=0
When x = 0, XF (2x-1) = 0, if XF (2x-1) 0 is not satisfied, because XF (2x-1) 1 / 2, x > 1 / 2 is obtained by taking the intersection with x > 0
When x

English translation
Log in or log on? Sign up or sign off?

Log in is log in, log out is log out, and log out is log out

How many square meters is 47.25 square decimeters equal to?

47.25 square decimeter = 0.4725 square meter

Calculation: 1 x (x + 1) + 1 (x + 1) (x + 2) + 1 (x + 2) (x + 3) + +1 (x + 1998) (x + 1999)

1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+… +1(x+1998)(x+1999)=1x−1x+1+1x+1−1x+2+1x+2−1x+3+… +When x = 1, the original formula is 1-11 + 1999 = 19992000