535-36, 541-42, 545, 575-77, 579-80 —.

Vs 3U G 1 2V,+2V« 1 3+2 =5 Is/, 87, l1/. Ms D 1 21/*+21/1 1 6 6 l1/. 9 9 3 41/, 60% D 1 2‘/2+2*/2=5 1 6 2+f =3 4.