Răspuns :
x+y=234
x-x/7=6x/7
y+x/7=(x-x/7)/2
y=6x/14-x/7
y=4x/14
y=2x/7
x+2x/7=234 o inmultim cu 7 sa scapam de fractie
9x=234·7
x=182
y=52
x-x/7=6x/7
y+x/7=(x-x/7)/2
y=6x/14-x/7
y=4x/14
y=2x/7
x+2x/7=234 o inmultim cu 7 sa scapam de fractie
9x=234·7
x=182
y=52
x-primul elev; y-al doilea elev x+y=234 (1)
x-x/7=2(y+x/7) => 6x/7=2y+2x/7 => 6x/7-2x/7=2y
4x/7=2y
x=14y/4=7y/2
Inlocuiesti in suma din relatia (1) => 7y/2+y=234
9y/2=234 => 9y=468 => y=52 si x=182
Sper ca ai inteles.