Dau coroana varog repede

Răspuns:
x + 624 < 629
x < 629 - 624
x < 5
x = { 0,1,2,3,4}
x-401 < 5
x < 407
x={0,1,2,3,....,405,406}
=>x ={0,1,2,3,4}
Răspuns:
a+624=629-1
a+624=628=>a=628-624=>a=4
a+624=629-2=>a=627-624=>a=3
a+624=692-3=>a=2
a+624=692-4=>a=1
a+624=692-5=>a=0
a=0,1,2,3,4
________
a-401=0=>a=401
a-401=1=>a=401+1=>a=402
a-401=2=>a=401+2=>a=403
a-401=3=>a=401+3=>a=404
a-401=4=>a=401+4=>a=405
a=401,402,403,404,405