Răspuns :
a-b-c=63.421
a-2.131-11.202=63.421
a-2.131=63.421+11.202
a=74.623+2.131
a=76.754
a+b-c=?
76.754+2.131-11.202=78.885-11.202=67.683
a-2.131-11.202=63.421
a-2.131=63.421+11.202
a=74.623+2.131
a=76.754
a+b-c=?
76.754+2.131-11.202=78.885-11.202=67.683