Răspuns :
a+b=863 rezulta ca b=863-a
a-b=247 rezulta ca b=247+a
863-a=247+a
2a=863+247
2a=1110
a=1110:2
a=555
a+b=863
555+b=863
b=863-555
b=308
a-b=247
555-308=248
a-b=247 rezulta ca b=247+a
863-a=247+a
2a=863+247
2a=1110
a=1110:2
a=555
a+b=863
555+b=863
b=863-555
b=308
a-b=247
555-308=248
a+b=863 => a=863-b => 863-b -b=247
a-b=247 863 - 2b=247
-2b=-616 |x(-1)
b= 616/2
b= 308
=> a + 308 = 863 => a=863 - 308=555
a=555
b=308
a-b=247 863 - 2b=247
-2b=-616 |x(-1)
b= 616/2
b= 308
=> a + 308 = 863 => a=863 - 308=555
a=555
b=308