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343.452+214.126+n=989.789 Cine ma poate ajuta???

Răspuns :

343.452+214.126+n=989.789
Calculam suma celor doua cunoscute.
557,578+n=989,789
Acum aflam necunoscuta
n=989,789-557.578
n=432,211
343.452+214.126+n=989.789
557.578+n=989.789
n=989.789-557.578
n=432.211