<span>(3 - √ 2) * (5 - √ 8) = 15 - 5 * √ 2 - 3 * √ 8 + √ 16 = 15 - 5 * √ 2 - 6 * √ 2 + 4 = 19 - 11 * √ 2</span>
21x + 7 - 15x = 8x + 35 - 3x
6x + 7 = 5x + 35
6x - 5x = 35 - 7
X = 28
1)х+х+10+0.3*(2х+10)=65
2,6х+13=65
2,6х=54
х=20-1 звено
2)20+10=30-2 звено
3)65-(20+30)=15-3 звено
Ответ:20,30,15