???? s?st?? ?s??? st????st?? s?????t???s? ??? r????t? ???? ??r??r?s ? ?????r ?? s?????t???s? ??? t??? ??tr??ts q???t?t??s ?? ??t?r?st ?r?? t?? s?????t?? s?????s? ????????? t?? r?s??ts ?r? st?t?st??s ?? ??rt??? ??r?????s ?? t?? s?????s? ???? t????????s ???r ????? ?? P?r???t?r ?????s ??r st????st?? s?????t???s ?r? t?? s??? ?s ?? ????? ?t ???? ?????? ?????t t??s? ,
??t??s s???? ?? ??s? ??r??r??? s?????t???s ??t? ? ???st??t ???? ???s?t?? ???st??t ??ss??? r????? r p = 100 ??? ??r???? r a ? t??t ?s? d = r a + 200? t??s s????r?? r?s?????s t??t ?? t?? st????st?? r??????s?? ????? ?? s??s??? t??? ?????? ??? r?s??ts ?r? ???s?st??t ??t? t?? st????st?? s?????t??? r?s??ts? s?? ,
?v ?t = c 4 u + c 5 v + c 6 + ? v ?v ? µ v v, ???r? u(x, t) ??? v(x, t) ?r? ??????tr?t???s ?? t?? t?? s?????s ?t s?s ???t??? ??str???t???s ?? t?? t?? s?????s ?? s????? ??t? s???? r????? ??rt?r??t???s? t??s s?s? t?? ????t????? ?????r??s t? ? st???? st?t?? ?t ??? r???? s?? ????r??t st?t?s? ,
????? t??t t?? ???t??? s????? ?s s?????r t??? t?? ??tt?r? ?ts???? ???r???r?? t?? s?st?? ?s ?r??????? ??t? ? r???st st???? ??tt?r?? ????? ?s ??t ????? s??????? ?? t?? ???t??? s?????? ??t??r? ?t ?s ?????? ?? t?? ?r???rt??s ?? t?? ???? r?????t?r? ??t??r?? ?? s????r?? t?? s???? r?????t??? ????s?? ?? t??s ?? s?st?? ???str???s t?? ,
r? ??t? w? t??s s?st?? st??? ??r?s t?? [v, u] ??tt?r? ?t st???? st?t?? ??t ??s? t?? ?r?????s?? ??s??? ??tt?r? [u, v ,
s?????t???s? ??t?r?st?????? s?????t???s r??????? t??t st????st???t? ???r t?? ???r?s? s??? ??????r? ?s ??r? ?r ,
s ?? t?? s?st?? s??? r?????s? ?????s? ?? t??s? ?? r?s?rt?? t? ????t?? st????st?? s?????t???s ??r t?? s??t??? ?????s? ,