Question

aflati 3 numere naturale a b si c care indeplinesc simultan egalitatile a+b=80 a+c=90 b+c=100

Answer 1

a+b=80
a+c=90
b+c=100
2(a+b+c)=270
a+b+c=135
a=35
c=55
b=45

Answer 2

a+b=80
a+c=90
b+c=100 le aduni
2a+2b+2c=270 deci a+b+c=135
80+c=135 deci c=55
55+b=100 deci b=45
a+45=80 deci a=35