The fourth problem is that we know the first-order function s = 3T + 2

Solution 1

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1. Given a function y = 2x-6 Q: when - 1 < x < 2, find the value range of Y
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3. Given the increasing function of F (x) in the domain of definition [- 2,1], f (t-1) < f (1-3T) can find the range of T
4. If a and B satisfy 3 √ a + 5 | B | = 7, what is the value range of S = 2 √ A-3 | B |? In a hurry···
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6. If a and B satisfy (3 radical a) + (5|b |) = 7, find the value range of S = (2 radical a) - (3|b |) There should be a reason
7. Sn = 1 + 1 / 2 + 1 / 3 +. + 1 / N, f (n) = s2n + 1-sn + 1, f (n) > m is constant, the value range of M is constant
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9. Let Sn = 1 / (n + 1) + 1 / (n + 2) + 1 / (n + 3). 1 / 2n, find the value range of Sn That n ∈ n, Sn should be f (n)
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11. If vectors a and B are two non-zero vectors, then the range of the angle between vectors a and B is A,（0,π） B,【0,π） C,（0,π】 D,
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15. It is known that the included angle of non-zero vectors a and B is 60 ° and | a | = | B | = 2. If vector C satisfies (A-C); (B-C) = 0, then | C | = 2? Is to find the value range
16. Given that the nonzero vector AB satisfies B = 1 and the angle between B and B-A is 30, then the value range of a is
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18. A1 = 1, Sn = nan-n (n-1), the general formula of an
19. Given that the sum of the first n terms of the sequence {an} is Sn = n2-2n + 3, then the general term formula of the sequence is______ ．
20. The general formula of Sn = 2n-n