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. 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
• 12. 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
• 13. 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!
• 14. 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
• 15. 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?
• 16. 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
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• 18. Vector a = (3, - 2), B = (- 2,1), C = (7, - 4) try a, B means C is vector!
• 19. Given the vector a = (5,10), B = (- 3, - 4), C = (5,0), let's use a and B to express the vector C
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