Răspuns :
a+217:100+1980=2000
a+217:100=2000-1980
=20
a+217=20x100
=2000
a=2000-217
a=1783
a+217:100=2000-1980
=20
a+217=20x100
=2000
a=2000-217
a=1783
(y+ 217 ): 100+ 1980 = 2000
(y+217):100= 2000-1980
y+217 = 20× 100
y=2000-217
y= 1783
(y+217):100= 2000-1980
y+217 = 20× 100
y=2000-217
y= 1783