Inequality | x-4 | + | x-3|

Inequality | x-4 | + | x-3|

|x-4|+|x-3|

The inequality (x-a) (x-a2) < 0 (a ∈ R) of solution about X

When a = A2, a = 0 or a = 1, X ∈ a, when a ＜ A2, a ＞ 1 or a ＜ 0, a ＜ x ＜ A2, when a ＞ A2, 0 ＜ a ＜ 1, A2 ＜ x ＜ a, when a ＜ 0, a ＜ x ＜ A2, when 0 ＜ a ＜ 1, A2 ＜ x ＜ a, when a ＞ 1, a ＜ x ＜ A2, when a = 0 or a = 1, X ∈ a

The sum of the first 20 terms of 1 'arithmetic sequence a (n) is 100, and the maximum value of the product of a (5) and a (16) is obtained.
2. X and y are positive integers, 30-x = 4Y to minimize the sum of the reciprocal of X and y,
Is 3 ` a + B ≥ 2 √ AB Tenable?
4 · x > 0, find the maximum value of y = 3-3x-x Λ (- 1).

Are you a question or a statement?
1、S20=10（a1+a20)=10(a5+a16)=100
(a5+a16)=10
a5*a6=2/√xy
If and only if 1 / x = 1 / y, i.e. x = y, take equality
Take in the equation 30-x = 4Y to get x = y = 6
3. The square formula of the difference is obtained by setting up the term shift
4、y=3-3x-1/x=3-(3x+1/x)