Question

a+b=154 a+ c=390 b+c=296 sa se afle numerele a b c

Answer 1

a+b+a+c+b+c=154+390+296=840
2×(a+b+c)=840
a+b+c=840÷2=420
c=420-154=266
a=420-296=124
b=296-266=30

Answer 2

a+b=154
a+c=390
b+c=296

a+c=390
a+b=154
se scad si obt: a+c-a-b=390-154
c-b=236
b+c=296
se aduna cele doua relatii si obt: c-b+b+c=236+296
2c=532
c=532:2
c=266 
a+266=390
a=390-266
a=124
124+b=154
b=154-124
b=30