Răspuns :
Scriem numerele necunoscute ca x si y:
x+y=35
x-y=7=>x=y+7
y+7+y=35⇔y=(35-7)/2=28/2=14;
y=14;
x=35-14=21;
x*y=21*14=294
x+y=35
x-y=7=>x=y+7
y+7+y=35⇔y=(35-7)/2=28/2=14;
y=14;
x=35-14=21;
x*y=21*14=294