Răspuns :
2.
953425-b=784579
b=953425-784579
b=168846
388873+a=908479
a=908479-388873
a=519606
c-567415=83764
c=83764+567415
c=651179
a+( 555432-222333)=456389
a+333099=456389
a=456389-333099
a=123290
3. Notam cu X numarul
Cel mai mare numar de 4 cifre diferite este 9876
X+9876+235087-13290=600000
X+244963-13290=600000
X+231673=600000
X=600000-231673
X=368327