![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
20-5/2-9/4-17/8-33/16-65/32-29/64=?
20-5/2-9/4-17/8-33/16-65/32-129/64
=20-2×6-（1/2+1/4+1/8+1/32+1/64+1/128）
=8-（1-1/128）
=7 and 1 / 128
There are four rational numbers, of which the sum of every three numbers is 2, 17, - 1, - 3 respectively. What are the four rational numbers?
It's 20:00 today
a+b+c=2
b+c+d=17
c+d+a=-1
d+a+b=-3
Add up the four formulas
3a+3b+3c+3d=15
a+b+c+d=5
Subtract from the above four formulas
d=5-2=3
a=5-17=-12
b=5-(-1) = 6
c=5-(=3) = 8
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