Given 2A + B = (- 4,3), a-2b = (3,4), find: (1) the coordinates of a and B; (2) | a + B | All letters are vectors

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• 1. urgent It is known that the vertex of △ ABC is a (0,0) B (4,8) C (6, - 4) point m on the line AB, the tangent vector am = 3MB, the point P on the line AC, and the area of △ APM is the general of △ ABC. The coordinates of point P can be obtained
• 2. On the sides OA and ob of the triangle OAB, there are two points P and Q respectively. It is known that OP: PA = 1:2, OQ: QB = 3:2, connecting AQ and BP. Let their intersection be r, if the vector OA is vector a and the vector ob is vector B Use vector a and vector B to represent vector or
• 3. We know that vector a = (cos3 / 2x, SIN3 / 2x), vector b = (cosx / 2, - SiNx / 2), and 0 The second question f (x) = (vector a dot multiplied by vector b) - 2 times m multiplied by (absolute value of a + b) The minimum value of F (x) is - 3 / 2, and the value of real number m is obtained
• 4. Vector, how many kinds of explanation, its basic meaning is what, in UG vector is what consciousness, new people for guidance
• 5. Maxwell's law of total current: ∮ l HDL = I (total), who can explain the meaning of the integral part on the left side of the equal sign Such as the title
• 6. Explain the meaning of electricity
• 7. #define TAILQ_ INSERT_ AFTER(head,listelm,elm,field) do { \ if ((TAILQ_ NEXT((elm),field) = TAILQ_ NEXT((listelm),field)) = NULL)\ TAILQ_ NEXT((elm),field)-> field.tqe_ prev = \ &TAILQ_ NEXT((elm),field); \ else \ (head)->tqh_ last = &TAILQ_ NEXT((elm),field); \ TAILQ_ NEXT((listelm),field) = (elm); \ (elm)-> field.tqe_ prev = &TAILQ_ NEXT((listelm),field); \ } while (0)
• 8. In △ ABC, a, B and C are the opposite sides of angles a, B and C respectively. Given vector M = (a, b), vector n = (COSA, CoSb), vector p = (2 √ 2Sin (B + C) / 2,2sina), if vector m ‖ vector n, vector p ^ 2 = 9, we prove that △ ABC is an equilateral triangle
• 9. A vector a and B, if a & # 178; = B & # 178;, then a = B or a = - B The answer is wrong, but I don't know why,
• 10. The vector a module is root 3, the vector b module is 1, and the angle between a and B is 30 degrees. Find the angle between vector (a + b) and vector (a-b)
• 11. The definition of scalar and vector in Physics Please specify and list the related items. Thank you!
• 12. What are vectors and vectors?
• 13. What's the difference between vector and vector?
• 14. The difference between vector and vector~~ What's the difference between vector and vector, or do they mean the same thing?
• 15. Vector addition and subtraction, I can only draw and calculate, how to do
• 16. Mathematical vector judgment If vector a is parallel to vector B and vector B is parallel to vector C, then vector a is parallel to vector C
• 17. A judging problem of vector Let a, B and C be arbitrary non-zero plane vectors which are not collinear with each other 1.（a*b)*c-(c*a)*b=0 2.|a|-|b|＜|a-b| 3. (b * c) * a - (c * a) * B is not perpendicular to C 4.（3a+2b)*(3a-2b)=9|a|²-4|b|² Hope there is an explanation thank you
• 18. Simple vector judgment The necessary and sufficient condition for vectors a and B to be collinear is that "there exists n ∈ R, B = n * a" The answer is incorrect. Why? (2008 Hainan, Ningxia, Wen 9 li 8)
• 19. On the judgement of vector If E1 and E2 are a set of bases of all vectors in the plane, then any vector a in the space can be expressed as A = n1e1 + n2e2 (N1. N2 is a real number)
• 20. Vector judgment "If | a | = | B |, a and B are vectors, then a and B have the same length and the same or opposite direction." What's wrong with this sentence? Why? Thank you!