6а²-(9а²-5аb)+(3a²-2ab),если a=-0,15,b=6

6а²-(9а²-5аb)+(3a²-2ab) = 6а²-9а²+5аb+3a²-2ab = 3ab при а = -0,15; b=6 3ab = 3*(-0,15)*6 = -2,7