Răspuns :
a+b=5663 2b+685=5663 b=4978:2 a=2489+685
a-b=685 2b=5663-685 b=2489 a=3174
a=b+685 2b=4978
a-b=685 2b=5663-685 b=2489 a=3174
a=b+685 2b=4978