Răspuns :
a+b+c=75
a=4b
c= 2b+ 19
4b+b+2b+19=75
7b=75-19
7b=56
b=56:7
b=8
a= 4 x 8 =32
c= 2 x 8 +19= 35
a=4b
c= 2b+ 19
4b+b+2b+19=75
7b=75-19
7b=56
b=56:7
b=8
a= 4 x 8 =32
c= 2 x 8 +19= 35
a+b+c=75
a=bx4
b=a impartit la 4
c=2b+19
bx4+b+2b+19=75
7b+19=75
7b=75-19
7b=56
b=8
a=32
c=16+19
c=35