Решение
(9.2.1)
(9.2.2)
![S[0] = `*`(550, .8)](images/e_52.gif){kind=small}
![S[0] = 440.0](images/e_53.gif){kind=small}
![S[200] = `+`(208, `*`(.6, `*`(`+`(550, -200))))](images/e_54.gif){kind=small}
![S[200] = 418.0](images/e_55.gif){kind=small}
![S[800] = 736](images/e_56.gif){kind=small}