0 = (5 - 5)*555
1 = 5 - (5*5 - 5)/5
5 = 5 + 55 - 55
6 = 5 + 55/55
7 = 5 + 5/5 + 5/5
15 = 5 + 5 + 5 + 5 - 5
17 = ???
20 = 5*5 - 5 + 5 - 5
1 + 7 = 8
2 + 6 = 8
3 + 5 = 8
4 + 4 = 8
18,08-х=10,7
х=18,08-10,7
х=7,38
= -3,2pa+4ba+0,96a
=ad+3,4bd-3cd
= -6х+9у-7z+2,8