Current location - Training Enrollment Network - Mathematics courses - Find a master to solve a math problem, A+B= 13, A+C=9, B+C= 12. What is ABC? Let's give a formula.
Find a master to solve a math problem, A+B= 13, A+C=9, B+C= 12. What is ABC? Let's give a formula.
Solution:

A+B= 13,A+C=9,B+C= 12

So,

(A+B)+(A+C)+(B+C)= 13+9+ 12 = 34

that is

2A+2B+2C=34

A+B+C= 17

Therefore, a =17-(b+c) =17-12 = 5.

B= 17-(A+C)= 17-9=8

c = 17-(A+B)= 17- 13 = 4