Vector a (m, 2m), vector b (- - 3M, 2) if the angle between vector a and vector B is an obtuse angle, how can we solve the problem of the value range of M?

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• 1. Given the vectors a = (x, 2) and B = (- 3, - 5), the angle between a and B is obtuse angle, find the value range of X
• 2. Given that a = (x, 2), B = (- 3, 5), and the angle between a and B is obtuse, then the value range of X is? Letter A. B is vector!
• 3. Given that vector a = (2, x), vector b = (3, 4), and the angle between vector a and vector B is obtuse, then the value range of X is___ A.x>-2/3 B. X > - 2 / 3 and X ≠ 8 / 3 C. X2 / 3 and X ≠ 8 / 3
• 4. Given the vector a = (a, 2), B = (- 3, 5), and the angle between vector a and vector B is obtuse angle, the value range of a is obtained Given the vector a = (in, - 2), B = (- 3,5), and the angle between a and B is obtuse, then the value range of in
• 5. Given the vector a = (E, 2), B = (- 3, 5), and the angle between a and B is obtuse, what is the value range of E,
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• 11. If the angle between vector a = (3, m, 4) and B = (- 2, 2, m) is obtuse, then the value range of M, please write the detailed process, the answer is m
• 12. If a = (1,2), B = (- 1,0), C = (4,6) are given, and a and B are used to represent C, what is C
• 13. Vector a = (3, - 2), B = (- 2,1), C = (7, - 4) try a, B means C is vector!
• 14. Given the vector a = (5,10), B = (- 3, - 4), C = (5,0), let's use a and B to express the vector C
• 15. Given the vector a = (3, - 2) B = (- 2, - 1), C = (7, - 4), and C = λ a + μ B, what are the values of λ and μ
• 16. Given vector M = (2cos & # 178; X, √ 3) n = (1, sin2x) function f (x) = m * n (2) In the triangle ABC, ABC is the opposite side of the angle ABC and f (c) = 3, C = 1 and a > b > C respectively
• 17. We know the vector M = (2sinx / 2, - root 3), n = (1-2sin & # 178; X / 4, cosx), where x belongs to R 1. If M is perpendicular to N, find the set of values of X 2. If f (x) = m * n-2t, when x belongs to [0, π], the function f (x) has two zeros, and the value range of real number T is obtained
• 18. In the triangle ABC, the opposite sides of a, B and C are respectively a, B and C. The vector M = (COSA, 1) the vector n = (1,1-radical 3sina), and the vector m ⊥ n (1) finds the size of angle a (2) if B + C = radical 3A, finds the size of B and C
• 19. In △ ABC, the opposite sides of a, B and C are a, B and C respectively, the vector M = (COSA, 1), the vector n = (1,1-radical 3sina), and the vector m ⊥ the vector n, the size of a is calculated
• 20. It is known that a.b.c. is the three internal angles of a.b.c. the vector M = (- 2,1), n = (COS (a + π / 6), sin (a - π / 3)), and M is perpendicular to n Find the angle a if Sin & # 178; c-cos & # 178; C / (1-sin2c) = - 2, find the value of tanb