1/2+5/6+11/12+19/20+ ---- +89/90+109/110

1/2+5/6+11/12+19/20+…… +89/90+109/110 =1-1/2+1-1/6+1-1/12…… +1-1/110 =10-(1/2+1/6+1/12…… +1/110) =10-(1/2+1/2-1/3+1/3-1/4+1/5-1/5…… +1/10-1/11) =10-10/11 =100/11

RELATED INFORMATIONS

1. 11 / 20-19 / 30 + 29 / 42-41 / 56 + 55 / 72-71 / 90 + 89 / 110-109 / 132, there should be a process
2. 12+56+1112+1920+2930+… +97019702+98999900．
3. One half plus five sixths plus eleven twelfth plus nineteen twenties plus twenty-nine thirties. To 9899 9900 It's the method, not the calculation
4. 12+56+1112+1920+… +98999900=______ ．
5. 12+56+1112+1920+2930+… +97019702+98999900．
6. How much is half plus five sixths plus eleven twelfth plus nineteen twentieth? It must be a simple calculation and try not to divide
7. One out of two plus one out of six plus one out of twelve plus one out of twenty plus one out of thirty
8. Two percent plus one sixth plus one twelfth plus one twentieth What's one in 110?
9. (): 24 = 3 / 8-12 divided by () = 30 ()
10. (): 24 = 3 / 8 = 12 divided by () = () 24 / 8
11. 3 / 13, 4 / 19, 8 / 23, 12 / 35, 24 / 59
12. 18 / 5 + 10 / 7 + 18 / 13 + 10 / 1 is equal to?
13. 1-18 / 1 is equal to?
14. What is 1 / 106:1.69/44:17/18
15. From the conversation with the doctor, Xiaojiang learned that adults need about 8L oxygen per minute. How many liters of air do adults need per minute? What is the mass of 8L oxygen in standard condition? What is the mass of air required? (oxygen density = 1.429g/l, air density = 1.293g/l)
16. The number of girls in the school sports team is two fifths of the number of boys, and then there are three boys. At this time, the number of girls is one fifth of the number of boys Three eighths, how many people are there in sports now?
17. 2.5 times two fifths
18. 6 × 3 / 4 = 27 / 5 × 4 / 3 = 15 / 2 × 6 / 5 = remember about!
19. -Three and seventeen four times two and fifteen two seven and seventeen four times fourteen and fifteen thirteen four times (- fourteen and fifteen thirteen) Come on, in a hurry!
20. What can be easily calculated should be 1 / 4 × 4.6 + 27 / 5 × 25%