1.

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. 1
     D. , 120o. (. 1). . 2 , .

. 2b

        . , , ,
        . 3 t1, t2, t3. +1, +2, +3.



. 3

        t = t1 - , -Y C-Z - . -. t = t2 - -Z . . 30o. t = t3 - -Y , C-Z , -Z. 360o.

,

        f1 - ;
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             n1 - .
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          - D.
 
     (1)
         n1 - .
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        , D , . , (1), , n1 = 1500 /.
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. , - - , 120 .

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- C , 5, - 10
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