1 / 2 * 3 + 1 / 3 * 4 + 1 / 4 * 5 + 1 / 5 * 6 + 1 / 6 * 7 + 1 / 7 * 8 + 1 / 8 * 9 + 1 / 9 * 10 + 1 / 10 * 11 (simple calculation)

The original formula is 1 / 2-1 / 3 + 1 / 3-1 / 4 + 1 / 5-1 / 6 + +1／10－1／11
=1／2－1／11
=9／22

If you can use simple calculation, you can simply calculate 7 / 9 / 11 / 5 + 2 / 9 * 5 / 11

7/9/11/5+2/9*5/11
=7/9*5/11+2/9*5/11
=(7/9+2/9)*5/11
=5/11

1/3+1/5+1/7+1/9+1/11+…… +1 / 4019 =? Ideas and answers of simple calculation
1/3+1/5+1/7+1/9+1/11+…… +1/4019=?
Ideas and answers of simple calculation
The solution suitable for the first day of junior high school

Do you use programming to do that? It's impossible to use mathematics. You can only do dead calculation. This is totally unskilled
#include
#include
void main()
{
int a;
float sum,b;
sum=0;
b=1.0;
for(a=1;a

Simple calculation of 5 / 9 × 86 and 7 / 11 + 5 / 11 × 9 / 1 + 4 × 5 / 11

The simple solution of 5 / 9 × 86 and 7 / 11 + 5 / 11 × 9 / 1 + 4 × 5 / 11 is as follows: (5 / 9) * (86 and 7 / 11) + (5 / 11) * 9 + 4 * (5 / 11) = (5 / 9) [86 + (7 / 11)] + 9 * (5 / 11) + 4 * (5 / 11) = = (5 / 9) * 86 + (5 / 9) * (7 / 11) + 9 * (5 / 11) + 4 * (5 / 11) = = (5 / 9) * (86 + (5 / 9) * [(2 / 11) + (5 / 11)] + 9 * (5 / 11) + 4 * (5 / 11) = = = (5 / 9) * (86 + (5 / 9) * [(2 / 11) + (5 / 11)] + 9 * (5 / 11) + 4 * (5 / 11)

1 / 2 * 3 + 1 / 3 * 4 + 1 / 4 * 5 + 1 / 5 * 6 + 1 / 6 * 7 + 1 / 7 * 8 + 1 / 8 * 9 + 1 / 9 * 10 + 1 / 10 * 11 (simple calculation)