OPUŚĆ NAWIASY I OBLICZ :
-(6-9)-(-12+15) = ?
Musi wyjść 0, proszę z dokładnymi obliczeniami .
-(6-9)-(-12+15)= -6+9+12-15 = 3-3=0
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-(6-9)-(-12+15)= -6+9+12-15 = 3-3=0