0,85×1/6+1/3×0,25-1/6×0,65-0,65×1/3

0,85×1/6+1/3×0,25-1/6×0,65-0,65×1/3=(1/6)·(0,85-0,65)-(1/3)·(0,65-0/25)==(1/6)·(0,2)-(1/3)·(0,4)=(1/3)·(0,1-0,4)=-0,1=