Question

determinați toate numerle care împărţite la 13 dau restul egal cu câtul

Answer 1

13x0+0=0

13x1+1=13+1=14

13x2+2=26+2=28

13x3+3=39+3=42

13x4+4=52+4=56

13x5+5=65+5=70

13x6+6=78+6=84

13x7+7=91+7=98

13x8+8=104+8=112

13x9+9=117+9=126

13x10+10=130+10=140

13x11+11=143+11=154

13x12+12=156+12=168

Answer 2

x/13=c(rest r)
unde  c = r
deci, r≤13
r=0⇒c=0⇒x/13=0(rest0)⇒x=13×0+0⇒x=0+0=0
r=1⇒c=1⇒x/13=1(rest1)⇒x=13×1+1⇒x=13+1=14
r=2⇒c=2⇒x/13=2(rest2)⇒x=13×2+2⇒x=26+2=28
r=3⇒c=3⇒x/13=3(rest3)⇒x=13*3+3⇒x=39+3=42
continui sa  dai valori lui r si lui c pana la ultima cifra, adica :
r=13⇒c=13⇒x/13=13(rest13)⇒x=13×13+13=169+13=182