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Urgent to find two basic mathematical inequalities (mean inequality) in senior one! ! ! ! ! !
Solution: 1, first set two functions: y? =|x+ 1|，y？ =|x|。

Draw the images of these two functions, and you can see: y? -Really? The minimum value of is-1.

Make one

∴a<； -1, written in interval form: A is contained in (-1, -∞).

Sorry, there is no time to answer the second question. I'm going out.

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