Question

A + B = 32, B + C = 40, C + A = 26. Ile wynosi A + B + C? Znajdź liczby A, B, C.

Answer 1

A + B=32

B+ C = 40

C+ A= 26

 

a= 32 - b

c= 40 - b

32 - b + 40 - b = 26 /+ 2b

72 = 26 + 2b /- 26

46 = 2b

b = 23

 

23 + a = 32 / -23

a = 9

c + 9 =26 / -9

c= 17

 

17 + 23 + 9= 49