Question

Află produsul numerelor a b c stiind că : a+b=27, b+c=15, a+c=26

Answer 1

a+b=27=>b=27-a
b+c=15=>c=15-b

27-a+c=15
a+c=27-15=12

a+b=27
b+c=15
a+c=12
2a+2b+2c=27+15+12
2a+2b+2c=54

Folosim factor comun:

2x(a+b+c)=54
a+b+c=54:2=27

c=
27+c=27
c=27-27
c=0

a=
a+c=12
a+0=12
a=12-0
a=12

b=
a+b=27
12+b=27
b=27-12
b=15

0x15x12=0

Orice nr. inmultit cu 0=0