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determinati numarul abc daca abc+bc+c= 989. Ajutati-ma dau coroana

Răspuns :

abc+
  bc
    c
___
989
Avem 3c=9 =>c=3
Avem 2b=8 =>b=4
Avem a=9
=>Numarul abc este 943
abc+bc+c=989
--------------------
a=?b=?c=?

(a*100+b*10+c)+(b*10+c)+c=980
a*100+2b*10+3c=980
9*100+8*10+9=989
900+80+9=989.................=>

a=900    =>a=900:1... =>a=900
2b=80....=>b=80:2      =>b=40
3c=9......=>c=9:3        =>c=3................si avem:

abc=900+40+3
      =943
  bc=40+3
       =43
     c=3.......=>

abc+bc+c=989
943+43+3=
=986+3
=989