What's the significance of quadratic term theorem and why should we learn it?

In order to solve the problem of (a + b) ^ n
(a+b)^n＝Cn^0*an+Cn^1*an-1b1+… +Cn^r*an-rbr+… +Cn^n*bn(n∈N*)

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1. Using Veda's law, if two equations are known, write out the quadratic equation of one variable X1=8 X2=3;
2. Weida's law for solving equations x. Y is the square of the equation x - 4x + 2 = 0 The value of the square of (X-Y) And the value of X / y + Y / X
3. Under what circumstances should we use Veda's law How to use in function or equation What kind of questions will be more specific?
4. Veda's law + two roots + solving quadratic equation with one variable Using Veda's law, if two equations are known, write out the quadratic equation of one variable X1=8 X2=3;
5. Derivation of Weida formula?
6. What is Veda's law?
7. The problem of Veda's law If Aerfa and Beita are two of the equations x ^ 2-2x-2001 = 0, find Aerfa ^ 2 + 3aerfa + Beita If α β is two of the equation x ^ 2-2x-2001 = 0, find the value of α ^ 2 + 3 α + β
8. Quadratic term theorem problem! Urgent! It is proved that: (2 ^ 6n-3) + (3 ^ 2n-1) can be divisible by 11 sorry, The title should be 2 ^ (6n-3) + 3 ^ (2n-1)
9. In the 100th expansion of (1 + x-k * x), find the value of K which makes the coefficient of the 4th term of x the minimum
10. The problem of quadratic term theorem The coefficient sum of each expansion
11. The theoretical and practical significance of Engel's coefficient
12. What is the theorem of relation between root and coefficient
13. In the plane, three common point force vectors F1, F2 and F3 are in equilibrium. It is known that the module of vector F1 is 1n, the module of vector F2 is (radical 6 + radical 2) / 2n, and the angle between vector F1 and vector F2 is 45 degrees 1) Find the size of the vector F3 2) The angle between vector F1 and vector F3
14. In △ ABC, it is known that the maximum internal angle a is twice of the minimum internal angle c, and the lengths of three sides a, B and C are three continuous positive integers, so the lengths of each side can be calculated
15. In △ ABC, given AC = 16, area s = 220 √ 3, find the minimum value of A, Tick is the root sign Can someone tell me why everyone who answers the question says B = 16? How does that work out?
16. In △ ABC, a = 32 °, B = 81.8 ° and a = 42.9cm 2 in △ ABC, a = 20cm, B = 28cm, a = 40 ° to solve triangle 3 in △ ABC, a = 2 √ 3, C = √ 6 + √ 2, B = 60 ° to find B and a 4 in △ ABC, a = 134.6cm, B = 87.8cm, C = 161.7cm, solve triangle 5 in △ ABC, if a & sup2; = B & sup2; + BC + C & sup2;, then a =? 6 in △ ABC, if sinA:sinB If: sinc = 7:8:13, then C =? 7 in △ ABC, ab = √ 6 - √ 2, C = 30 °, then the maximum value of AC + BC is? 8 in △ ABC, if Asina + bsinb = csinc, what is the shape of △ ABC? 9 in △ ABC, prove a / B-B / a = C (CoSb / b-cosa / a)
17. 1. If two straight lines a and B are different, how can the plane passing through a and perpendicular to B not exist? I don't know. How can there be one? 2. The side of a pyramid is a triangle with a common vertex. If the side of a pyramid is an equilateral triangle, how many side triangles does the pyramid have at most? What is a triangle with a common vertex? What does it look like-
18. Exponential formula is written as logarithmic formula: 4 ^ x = 1 / 6; 4 ^ x = 2. Please write the process. I just learned logarithm, Don't you have to write x = how much
19. In the triangle ABC, a, B and C are the opposite sides of three internal angles a, B and C respectively, and a, B and C are not equal to each other. Let a = 4, C = 3 and a = 2C 1. Find the value of COSC 2. Find the value of B
20. Given 4B = 3b, 2b = 3C, find a: B = (): () B: C = (): () a: C = (): () Given 4A = 3b, 2b = 3C, find a: B = (): () B: C = (): () a: C = (): ()