Решение задачи #72773
(1/(25*26)+1/(26*27)+1/(27*28)+1/(28*29)+1/(29*30))*150+1+1.03/(10.3*(x-1))=11
( | 1 25*26 | + | 1 26*27 | + | 1 27*28 | + | 1 28*29 | + | 1 29*30 | )*150 + 1 + | 1.03 10.3*(x-1) | =11 |
( | 3 13 | + | 25 13*9 | + | 25 9*14 | + | 75 14*29 | + | 5 29 | ) + | 1 10(x-1) | =10 |
3(9*14*29) + (25*14*29) + (25*13*29) + (75*13*9) + 5(13*9*14) 13*9*14*29 | + | 1 10(x-1) | =10 |
54810 2*7*9*13*29 | + | 1 10(x-1) | =10 |
15 13 | + | 1 10(x-1) | =10 |
150(x - 1) + 13 = 1300(x - 1)
150x - 150 + 13 - 1300x + 1300 = 0
1150x = 1163
x = 1163/1150
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