How does the author feel about Peking University

How does the author feel about Peking University

It expresses the complex feelings of loving Peking University, praising Peking University and leaving Peking University for the sake of Peking University

Answers to the sixth part exercise book of Peking University
For example, what does the soul of plum blossom refer to and the meaning of the third paragraph of the passage
Please prawns! 55555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555

It refers to the plum blossom's spirit of indomitable spirit

How to solve the equation: 30 times 5 + 5x + 5 = (30 times 5 + 5x) times 0.9

30×5+5X+5=（30×5+5X）×0.9
150+5x+5=(150+5X）×0.9
155+5x=135+4.5x
5x-4.5x=135-150
0.5x=-20
x=-40
The final result is minus 40, I will help you answer at any time!

The solution set of the inequality MX2 - (2m + 1) x + (m-1) ≥ 0 of X is a nonempty set, and the value range of M is obtained

When m = 0, the inequality can be reduced to - X-1 ≥ 0, that is, X ≤ - 1. Obviously, the solution set is a nonempty set. When m > 0, △ = [- (2m + 1)] 2-4m (m-1) = 8m + 1 > 0, the solution set of inequality MX2 - (2m + 1) x + (m-1) > 0 is a nonempty set

Tana = - 1.5667 a how to calculate. I use a calculator to calculate arctan-1.5667 to get a
Tana = - 1.5667 a how to calculate. I use a calculator to calculate arctan-1.5667 to get a number, how to calculate the degree of a

You just add 180 degrees to the negative number, because the period of Tana is π

Factorization factor 3x ^ 2n-12x ^ n 2008 & # 178; - 2007 × 2009

3x^2n-12x^n=3x^n(x^n-4)
2008²-2007×2009
=2008²-(2008-1)×(2008+1)
=2008²-2008²+1
=1

Find the binomial coefficient of the fourth term and the coefficient of the fourth term in the expansion of the third power of x plus the seventh power of 2x

(x³+2x)^7
T(r+1)=C(7,r)*(x³)^(7-r)*(2x)^r
=C(7,r)*2^r*x^(21-2r)
Let r = 3
T4=C(7,3)*2^3*x^(21-6)
So the binomial coefficient of the fourth term is C (7,3) = 35
The coefficient of the fourth term is C (7,3) * 2 ^ 3 = 280
Meituan of mathematics answers for you, please accept if you are satisfied, if you don't understand, please ask

(+ 1) + (- 2) + (+ 3) + (- 4)... + (+ 2005) + (- 2006) + 2007 =? How to calculate?
（+1）+（-2）+（+3）+（-4）...+（+2005）+（-2006）+2007=?
How does that count?

The problem is simple: two items are merged, and the sum of each item is - 1
1+(-2)
3+(-4).
If there are 1003 such items, then the sum is - 1003, and 2007 is left
So the final answer is 2007-1003 = 1004

Given that the equation x & # 178; Sina + 2xsinb + sinc = 0 has multiple roots, then the relationship between the three sides of triangle ABC satisfies?

It can be seen that the equation has multiple roots that the equation is a quadratic equation of one variable and the discriminant of the root is 0
That is, (2 × SINB) ^ 2-4 × Sina × sinc = 0
You can get it
(sinB)^2=sinA×sinC
So SINB / Sina = sinc / SINB
Combined with sine theorem, we can get
b/a=c/b
So B ^ 2 = AC

By using dichotomy, the approximate solution of the equation f (x) = x ^ 3 + x ^ 2-2x-2 = 0 in the interval [1,2] is obtained, which is accurate to 0.1

f(1)=-2
f(2)=6
f(1.5)=0.625
f(1.25)=-0.984375
f(1.375)=-0.259765625
f(1.4375)=0.161865234375
f(1.40625)=-0.054046630859375
Through the above calculation, the solution in the interval [1,2] is between 1.40625 and 1.4375, which is approximately 1.4