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Math genius problem in junior high school
(1) extends AD to E, so that DE=AD, even CE, AB=CE is congruent. In triangle ACE, the sum of two sides is greater than the third side, so 2AD is less than AC+AB.

(2) The sum of the two sides is greater than the third side, and the difference between the two sides is smaller than the third side, so the number 2 is smaller than the number 6.