Răspuns :
1 numar=5
2numar =x+1
3numar=x
ecuatia:5+x+1+x=18
6+2x=18
2x=18-6
2x=12
x=12/2
x=6
deci 1numar=5
2numar=7
3numar =6
2numar =x+1
3numar=x
ecuatia:5+x+1+x=18
6+2x=18
2x=18-6
2x=12
x=12/2
x=6
deci 1numar=5
2numar=7
3numar =6