Hi, i don't know about this strange problems.  please tell me why.(part.introduction to Real Numbers in problem1,2) that teachers don't explain any problems.just like as concept.

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I've looked at all 3 of the Real Number videos and the examples just deal with absolute inequality; <, >, absolute equality; =, and what I'll call inclusive inequality and those are the </= and >/=.  You'll see these more as you progress further in algebra. Now, absolute values are just that....they are absolute and always positive...but think of them more as distances from 0 like the instructor said in ex. 2.  Additionally, as you progress you'll see absolute values of expressions, polynomials, etc., associated with inequalities.  Hope this helps.