Please fill in different rational numbers in the circle as shown in the figure, so that the sum of the three numbers on each line is zero? The top number is - 20

Please fill in different rational numbers in the circle as shown in the figure, so that the sum of the three numbers on each line is zero? The top number is - 20

There are innumerable ways to fill in

Fill 1.2.3.4.5 in the circle to make the sum of the three numbers in horizontal and vertical lines equal. How to fill in? There are several filling methods?
Here's the picture
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[answer] I don't know how many ways to fill in. I only know that the circle crossed is 1, 3 and 5. The remaining four numbers are divided into two parts and filled in the circle

Fill in the six numbers 1.2.3.4.5.6 in the following circle, so that the sum of the three numbers on each line is equal to the number below
four
two
one
6 3
5 equals 9 (4 + 2 + 3 / 1 + 3 + 5 / 2 + 1 + 6)
In addition, I want to get the number of each place of 10.11.12, I want to know the formula
And a + B + C = 9, a + B-C = 1, A-B = 1
Find out what number ABC stands for (I want a formula)
I won't draw circles here, so the place where I write the numbers is the place where the circles are. Ha ha, thank you

Where is a small circle in 123456? Let me solve the next problem for you. (a + B + C) + (a + B-C) = 9 + 1 to get a + B = 5
(a + b) + (a-b) = 5 + 1 to get a = 3, substituting a = 3 into A-B = 1 to get b = 2
Substitute a = 3, B = 2 into a + B + C = 9 to get C = 4