Решить нужно найти: h 400 = 34 x 84 x h - ( 10 - 1 ) x 3.14 x 7.43^2 x ( h - 0.75 ) - 10 x 3.14 x 8.43^2 x 0.75

400 = 34 * 84 * Н - (10 - 1) * 3,14 * 7,43 ^2 * (H - 0.75) - 10 * 3.14 * 8.43^2 * 0.75
1) 34 * 84 * H = 2856H
2) (10 - 1) * 3.14 = 9 * 3.14 = 28.26
3) 7.43^2 = 55.2049
4) 55.2049 * (H - 0.75) = 55.2049 * H  - 41.403675
5) 28.26 * (55.2049H - 41.403675) = 1560.090474H - 1170.0678555
6) 10 * 3.14* 8.43^2 * 0.75 = 31.4 * 71.0649 * 0.75 = 1673.578395
7) 400 = 2856H - 1560.090474H - 1170.0678555 - 1673.578395
    400 + 1170.0678555 + 1673.578395 = 2856H - 1560.090474H
    3243.6462505 = 1295.909526H
     H = 3243.6462505 / 1295.909526
     H = 2.502988198961661