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What are the formulas of the four basic inequalities in senior high school?
Commonly used inequality formula:

①√((a? +b? )/2)≥(a+b)/2≥√ab≥2/( 1/a+ 1/b).

②√(ab)≤(a+b)/2 .

③a? +b? ≥2ab .

④ab≤(a+b)? /4。

⑤||a|-|b| |≤|a+b|≤|a|+|b| .

Principle:

① The inequality f (x): F(x) has the same solution.

② If the inequality f (x)

③ If inequality f (x): 0, inequality f (x)

④ inequality F(x)G(x)>0 and inequality have the same solution; Inequality f (x) g (x)