Răspuns :
a+b+c=7980
a=1760
b=a+999
c=?
b=1760+999
b=2759
1760+2759+c=7980
4519+c=7980
c=7980-4519
c=3461
a=1760
b=a+999
c=?
b=1760+999
b=2759
1760+2759+c=7980
4519+c=7980
c=7980-4519
c=3461
1760+a+b= 7980
a=1760+999
a=2759
b=7980-(1760+2759)
b= 7980-4519
b=3461.
1760+2759+3461=7980
sper ca te-am ajutat