Решение
(8.2.1)
(8.2.2)
![S[?] = `*`(700, .3)](images/e_36.gif){kind=small}
![S[?] = 210.0](images/e_37.gif){kind=small}
![S[:] = `+`(180, `*`(300, .2))](images/e_38.gif){kind=small}
![S[:] = 240.0](images/e_39.gif){kind=small}
![S[1] = 255](images/e_40.gif){kind=small}