👤

Determinati axbxc dacă a+b=20,b+c=31,a+c=27.


Răspuns :

a + b = 20
b + c = 31
a + c = 27
2a + 2b + 2c = 20 + 31 + 27
2 ( a + b + c ) = 78
a + b + c = 78 : 2
a + b + c = 39
20 + c = 39
c = 39 - 20
c = 19
a + c = 27
a = 27 - 19
a = 8
b + c = 31
b + 19 = 31
b = 31 - 19
b = 12
verificam
8 + 12 + 19 = 39
a x b x c = 8 x 12 x 19 = 96 x 19 = 1824