TEXT	{
:    .
: ,  a=b. 
a = b
a^2 = ab
a^2 - b^2 = ab - b^2
(a + b)(a - b) = b(a - b)
a + b = b
a = 0
 ,  a + b = b,  a = b,  b + b = b,  2b = b,  ,  2 = 1          .
-------------------------
            ,      10   - 5         5      .     ,    ,     10     ,  10     ,     30  .     ,        ,  25  ,   5   .      ,   1      ,    2   .       .  -  ,  5  ,         .  -       9  ,    2  ,    ,     29  .    ?
-------------------------
 : "   1  10,     ."
 1: "."
 : "   4."
 1: ",     6."
 : " ." <> "   1  10,     ."
 2: "."
 : "   7."
 2: "   3,   ...    7."
-------------------------
:   .
:   a  b,   t = a + b. 
a + b = t
(a + b)(a - b) = t(a - b)
a^2 - b^2 = ta - tb
a^2 - ta = b^2 - tb
a^2 - ta + (t^2)/4 = b^2 - tb + (t^2)/4
(a - t/2)^2 = (b - t/2)^2
a - t/2 = b - t/2
a = b
,   ,   ,   ,         ,       .
}