24.
244. .
245. :
();
, ();
();
-8, ( 34).
:
, /2;
() : , /2;
- , ( ), /2;
, , /2;
, ( 60 (/2) );
W - , ;
Q - (), /.
246. Q 2 / 40 / , , .
247. , 16 ( 4).
248. :
, = ----------- W
Q
:
( + )
= ----------------------- W
Q
249. , ():
= + + (/2)
250.
( + )
= ------------------------ W
Q
:
( + )
= ------------------------------- W
Q
251. , ( = 0,5). , , ( = ).
252. () ( , ) , 30 /2. , , 60 /2 .
253. , , 13.
254. 13.