3a is the line segment AB, so that AB=2a, a _ _ _ _ _ _ _ _.
(1)3a+2b is to draw BC to the right with point B as the endpoint, so BC = 2ba _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
(2)3a-2b, that is, with point B as the endpoint, draw BD to the left, so that BD = 2bd _ _ _ _ _ _ A _ _ _ _ _ _ B.
Because it is not easy to operate, the bottom of point A is connected together.
(Description, when 3a & gt2b, D is on the right of A,
When 3a=2b, d coincides with a,
Dang3a
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I also run a cram school. \ r \ n \ r \ There is no need to go through