0.1+0.3+0.5+0.7+0.9+0.11+0.13+…… +0.99 Simple calculation

Original formula = 0.1 + 0.11.1.13 +... + 0.97 + 0.99
=（0.1+0.9）+（0.3+0.7）+0.5+（0.11+0.99+0.13+0.97+0.15+0.95+0.17+0.93+0.19+0.91）+（0.31+0.79+...+0.39+0.71）+（0.51+0.53+0.55+0.57+0.59）
=2.5+5.5+5.5+2.75
=16.25

RELATED INFORMATIONS

1. 1+3+5+7+9+… +97+99+100．
2. -1+3-5+7+.+95-97+99=
3. 1\1*3+1\3*5+1\5*7+.+1\95+99+1\97+99=?
4. Calculation (- 1) + (+ 3) + (- 5) + (+ 7) +... (+ 95) + (- 97) + (+ 99)
5. What does 99 + 1 mean in 1-3 + 5-7 + 9-11 +... + 97-99 formula
6. 1＋3－5＋7－9……… - 97 + 99 observe the characteristics of the formula and evaluate it
7. Calculation (1 + 1 / 2) * (1-1 / 3) * (1 + 1 / 4) * (1-1 / 5) *. * (1 + 1 / 1000) * (1-1 / 1001)
8. 1 / 1 * 2 + 1 / 2 * 3 + 1 / 3 * 4 + ·· + 1 / 1000 * 1001
9. How to calculate (- 1) + (- 2) + (- 3) +... + (- 99) + (- 100)
10. Compare 1-1 / 2 + 1 / 3-1 / 4 +1 / 1997-1 / 1998 + 1 / 1991 and 1 / 1000 + 1 / 1001 + +The size of 1 / 1998 + 1 / 1999
11. 1+3+5+7+9+11+13+15+… +99
12. 1×3×5×7×9×11×13×… X 99
13. 1 / 1 + 2 + 1 / 1 + 2 + 3 + 1 / 1 + 2 + 3 + 4 + ellipsis + 1 / 1 + 2 + ellipsis + 99
14. 1 × 2 / 1 + 2 × 3 / 1 + 3 × 4 / 1 + +1 / 99 × 101=
15. 1 + 3 = 22 = 4, 1 + 3 + 5 = 32 = 9, 1 + 3 + 5 + 7 = 42 = 16, then, 1 + 3 + 5 + 7 + 9 + +99=______ ．
16. 1 + 3 + 5 + 7 + 9 +... + 99 + 101 should be simple
17. How about 34 times 5 / 11 times 1 / 10 times 11 / 51
18. The formula is 0.25, three fifths, one eighth and six fifths
19. Can 0.2, 0.4, 0.6, four fifths form a proportion? Write the proportion as well~ What about two-thirds, five sixths, 15 and 12?
20. Can 0.6:4 and 9 / 5:2.4 make up the proportion