Răspuns :
a+b+c=138
a=2c=>c=a:2
b=a:4-2
a+a:4-2+a:2=138 amplificam
4a+a-8+2a=552
7a=552+8
a=560:7
a=80
c=80:2=40
b=80:4-2=20-2=18
a=2c=>c=a:2
b=a:4-2
a+a:4-2+a:2=138 amplificam
4a+a-8+2a=552
7a=552+8
a=560:7
a=80
c=80:2=40
b=80:4-2=20-2=18
a+b+c=38
a=2c,c=a/2
b=a/4-2,4b=a-8,b=a-8/4
a+a-8/4+a/2=138
4a+a-8+2a=552
7a=552+8=560
a=560:7=80
c=80:2=40
b=80-8/4=74:4=18
a=2c,c=a/2
b=a/4-2,4b=a-8,b=a-8/4
a+a-8/4+a/2=138
4a+a-8+2a=552
7a=552+8=560
a=560:7=80
c=80:2=40
b=80-8/4=74:4=18