Odpowiedzi

2010-02-04T17:48:53+01:00
10a²b + (2 1/2 a²b + 1/2ab²)-(7,5a²b-ab²)
= 10a²b +2,5a²b +0,5ab² -7,5a²b+ab²
= 5a²b +1,5ab²