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18.03.2013

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a, b, c . 2b = a + c (*).

ab, bc, ac . q. . :

q = bc/ab = ac/bc.

q = c/a = a/b.

, b2c2 = acab, .. bc = a2. b = a2/c.

b (*):

2a2/ c = a + ;

2a/ c = 1 + c/ a;

q = c/a ( , .. ) q2 + q - 2 = 0.

q = 1 q = -2. , q = 1, c/ a = a/ b = 1, .. a = b = c, , .. 0. q = -2.

: -2.


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